Verdi Requiem Essay Example for Free

Verdi Requiem Essay All but one of Guiseppe Verdis masterworks are operas. This poses a problem for those of us who arent opera buffs. Fortunately, though, that one exception is his stunning Requiem, into which he poured the same vibrant emotion that thrills opera fans, but without the trite plots, simplistic characters and dull narrative stretches that tend to alienate others. Indeed, more than a few critics have hailed the Requiem as Verdis finest opera. Verdis inspiration was neither religious, egotistical nor fiscal. Rather, his gesture was one of national pride. He considered the opera composer Gioacchino Rossini one of the two greatest Italian artists of his time. Four days after Rossinis death on November 13, 1868, Verdi wrote his publisher Ricordi to propose a requiem mass to be given one year later in Rossinis heartland of Bologna. Each of the twelve sections was to be written by an Italian composer, so that the result would compensate for any lack of unity with a variety of universal veneration. Verdi himself would supply the concluding section. There was to be no foreign hand, nor hand foreign to art, no matter how powerful, to help us. To avoid petty vanity, all composers and performers were to contribute their services. To avoid exploitation, the score was to be sealed in the city archives and presented only on subsequent anniversaries of Rossinis death. While all the assignments were completed in ample time, the performance never materialized, the organizing committee was disbanded, Verdi refused to allow publication or performance of his portion, and in 1873 his score was returned. He soon found another appropriate use for it. Verdis other idol was Alessandro Manzoni. Although Manzoni had written only a single novel, I promessi sposi (The Betrothed), it was so popular that the author became the leading Italian literary figure of the century. A sprawling historical tale of peasant lovers buffeted by and triumphing over the repression of society, religion and injustice, it emerged as the driving literary force of the Risorgimento movement for Italian unification. Originally published in 1827, in 1840 Manzoni rewrote it in Tuscan, which he considered the pure indigenous Italian language. William Manning notes that beneath its plot and characters, it served as a kind of stylebook of the  language of a country which though politically united was linguistically chaotic. Alessandro Manzoni (1785-1873) As a teenager, Verdi had read the book following its initial publication and came to view it as serving two complementary and ideal uses of art for social ends not only did it transcend politics to rally people by appealing to their collective roots, but its popularity served as a cultural emissary to attract the worlds attention and admiration. When he finally met Manzoni in 1868, Verdi revered him as a saint. Although Manzonis death in his 89th year was hardly unexpected, Verdi was deeply grieved. The next day he wrote to his publisher Ricordi that although he wouldnt attend the funeral, I will come in a little while to visit his tomb, alone and without being seen, and perhaps (after further meditation and after having gauged my strength) to suggest something to honor his memory. The next week Verdi made his pilgrimage, condemned the many published tributes as superficial and resolved to write a requiem, but this time without the political snags and bickering that had thwarted his Rossini project. His proposal – to write the entire mass himself if Milan would fund its first performance. Despite opposition from the city council which already had funded a lavish funeral, the mayor accepted, the San Marco church in Venice was selected as the venue for its acoustics, the convention of using a priest to recite liturgy between musical numbers was bypassed, and the Archbishop gave special permission to use female performers on condition that they be veiled, dressed in black and hidden behind a grating. Verdis project was officially titled Messa da Requiem per lanniversario della morte de Manzoni, 22 Maggio 1874 (Requiem mass for the anniversary of Manzonis death, May 22, 1874). The resulting work was indeed as dramatic as any Verdi opera. George Marek calls it a prayer for peace by a man who had devoted his music to conflict. As George Martin has noted, it is suffused with Verdis personal doubts as to the efficacy of prayer, a concern perhaps heightened by his  advancing age and fear of what lay ahead. Indeed, the Requiems very strength lies in its exploration of Verdis ambivalent views toward religion, given reign through the unparalleled sense of theatre he had developed. Guiseppi Verdi (1813 – 1901) As Cecilia Porter notes, death is a complex character in the Requiem, playing multiple roles – an object of terror, a comforter, an emancipator – fully reflecting Verdis penchant toward intensely human drama rather than a staid presentation of liturgical dogma or an intellectual effort at theological exploration (a task which Verdi, a very plain man, could never have abided). Its indeed ironic that from this simple man, with no pretension of philosophical insight, arose a work that presents a far more potent sense of sophisticated (and quite modern) theology than the religious works of most of his predecessors. Martin further notes that since a requiem is an assortment of responses and prayers without a rigidly prescribed text, and since Verdi never intended his work to be sung as part of an actual church service, he could select and emphasize portions that ran the gamut of human experience, ranging from sadness to joy, simplicity to majesty, reflection to apocalypse. As a man of the theatre, Verdi chose to fashion these disparate elements into a drama from which solos would emerge as true individuals, rather than as offshoots of the massed choir. Indeed, his use of solo voices is daringly intricate – not the decorative figures of Haydn, nor the schematic personas in Bach cantatas, but multi-faceted roles that often complicate the texture to subtly question the apparent meaning of the wording presented by the underlying choral forces. The soprano, in particular, seems to voice Verdis own ambivalent skepticism, adding emotional intensity at odds with the faith-based text and affording a wide latitude for interpretation – indeed. in their respective recordings, Elizabeth Schwartzkopf whispers the final libera me, Galina Vishnevskaya nearly chokes on those words, and Herva Nelli snarls the passage as a stern defiant demand. Of Verdis primary models, Mozart had couched his Requiem in classical order, Cherubini had dwelled on the Offeratoriums hope for deliverance and Berlioz had deployed his massive performing forces only in the intensely powerful and vivid Dies irae, Lachrymosa and Sanctus sections, projecting throughout the remaining movements a somewhat meandering overall sense of peace and contentment amid ingenious sonic effects (including quadraphonic placement of voices and brass). In contrast, Verdis score is intensely melodic, tightly focused and bristles throughout with surging passion and challenging discomfort. Why did Verdi choose a mass, rather than an oratorio of Manzonis own words, to honor his hero? After all, although severely moral, Verdi was anti-clerical and an agnostic; his wife considered him an atheist and recalled that he would laugh and call her mad when she spoke of religion. Martin suggests historical and practical motivations – masses had been used by Cherubini and Rossini to honor departed public figures and thus a work in that genre was more likely to be welcomed elsewhere. Besides, Verdi already had a large emotional investment in his contribution to the aborted Rossini venture. Perhaps on a more personal level, Verdi found an outlet in the varied text of the requiem to explore his own ambivalent faith through his inherent sense of drama.

Chemical Composition of the Cell: Questions and Answers

Chemical Composition of the Cell: Questions and Answers Chemical Composition Of The Cell Question: Which of the following are called second class proteins? A. Plant proteins B. Animal proteins C. Food proteins D. Milk proteins Answer : A Reason: Plant proteins are called secondary class proteins because they generally contain less of the essential amino acids Question: How proteins can be broken? A. Enzymes B. Digestive enzymes C. Amino acids D. Diet Answer : B Reason: Proteins can be broken down by digestive enzymes into smaller polypeptides, dipeptides and the amino acids. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (603) Question : Which of the following can found a keratin in it? I. Hair II. Nail III. Feather IV. Fibroin in silk A. I and II only B. I and III only C. I, II and III D. I, II, III and IV Answer : D Reason: The secondary structure is the regular arrangement of the polypeptide chain to form a helix or pleated sheet maintained by hydrogen bonds. Example are keratin found in hair, nails, horn, feather and fibroin in silk. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (604) Question : Where are lipids will insoluble? A. In water B. Outside water C. In organic solvents D. Chloroform Answer : A Reason: Lipids are insoluble in water but soluble in organic solvents such as alcohol, either and chloroform. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (605) Question : How many main groups of lipids? A. 2 B. 3 C. 4 D. 5 Answer : C Reason: The main groups of lipids are four. There are: i. Fats and oil (also know as triglycerides) ii. Phospholipids iii. Steroids iv. Waxes Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (606) Question : Which of the following are another name for â€Å"bad cholesterol†? A. DLD cholesterol B. LDL cholesterol C. Glycero D. Ester Answer : B Reason: A high intake of saturated fats and cholesterol would increase LDL cholesterol (â€Å"bad† cholesterol) levels in the blood. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (607) Question : Which of the following is a precursor of cholesterol? I. Bile salts II. Vitamin D III. Steroids hormones IV. Vitamin A A. I and II only B. I and III only C. I, II and III D. I, II, III and IV Answer : C Reason: Cholesterol is a component of cell membrane. It is precursor of bile salts, vitamin D and steroid hormones such as oestrogen and testosterone. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (608) Question : Which of the following are formed by a phospholipids molecule? A. Condensation of glycerol molecule B. Other lipids C. Condensation of two glycerol D. Condensation of one glycerol Answer : D Reason: A phospholipid molecule is formed form condensation of one glycerol molecule with two fatty acid molecules and a phosphate group Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (609) Question : Which of the following are true about the similarities between unsaturated fats and saturated fats? I. Both are triglycerides II. They are formed from condensation of glycerol and fatty acids with removal of water III. Hydrolysis of triglycerides produces glycerol and fatty acids. IV. They function as an energy store and act as a source of energy for cellular metabolism A. I and II only B. I and III only C. I, II and III D. I, II, III and IV Answer : D Reason: The similarities between unsaturated fats and saturated fats are: i. Both are triglycerides ii. They are formed from condensation of glycerol and fatty acids with removal of water iii. Hydrolysis of triglycerides produces glycerol and fatty acids. iv. They function as an energy store and act as a source of energy for cellular metabolism. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (610) Question : Which of the following are secreted by the sebaceous gland? A. Sebum B. Cholesterol C. Phospholipids D. Lecithin Answer : A Reason: Sebum is a lipid secreted by the sebaceous gland Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (611) Question : What are esters of fatty acids with long-chain alcohols? A. Sebum B. Waxes C. Phospholipids D. Lecithin Answer : B Reason: Waxes are esters of fatty acids with long-chain alcohols Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (612) Question : Which of the followings also know as triglycerides? A. Steroids B. Fats and oils C. Phospholipids D. Lecithin Answer : B Reason: Fats and oils also knows as triglycerides Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (613) Question : What is the ration the hydrogen to oxygen? A. 1 : 2 B. 2 : 1 C. 2 : 2 D. 3 : 1 Answer : B Reason: Carbohydrates are organic compounds containing the elements carbon, hydrogen and oxygen. The hydrogen to oxygen ration is 2:1. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (614) Question : Which of the followings are the most common lipids? I. Fats II. Phospholipids III. Oils IV. Waxes A. I and II only B. I and III only C. I, II and III D. I, II, III and IV Answer : B Reason: Fats and oils are the most common lipids Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (615) Question : Which of the have a basic four interconnected ring hydrocarbon structure with different functional side chains? A. Fats and oils B. Phospholipids C. Waxes D. Steroids Answer : D Reason: Steroids have a basic four interconnected ring hydrocarbon structure with different functional side chains. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (616) Question : Which of the following statements regarding enzymes is true? A. All enzymes in living organisms have an optimum temperature of 37 °C. B. Enzymes increase the activation energy for the reactions they catalyse. C. Enzymes are denatured at 0 °C. D. Enzymes function as organic catalysts Answer : D Reason: The optimum temperature is the temperature at which the rate of reaction is at a maximum, which is about 35 40OC. Above the optimum temperature, the increased kinetic energy cause the chemical bonds, which hold the enzyme molecule in shape, to brake. For many organisms, the rate of reactions stops at 60OC due to complete denaturation of body enzymes. Enzymes function as organic catalysts Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (617) Question : The diagram shows the lock-and-key mechanism of enzyme action. Which of the following statements is correct? A. P is the key and Q is the lock B. Q is the lock and P is the key C. Q is the key and R is the lock D. R is the lock and Q is the key Answer : A Reason: The diagram shows the lock-and-key hypothesis to explain mechanism of enzyme action. Substrate molecule P acts as the â€Å"key† and enzyme molecule Q acts as the â€Å"lock†. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (618) Question : The graph shows the effect of increasing temperature on the rate of a chemical reaction controlled by enzyme catalase. Which is the correct line that continues the graph after 37 ºC? A. A B. B C. C D. D Answer : C Reason: The graph shows the effect of increasing temperature on the rate of a chemical reaction controlled by enzyme catalase. For many organism, the rate of reaction stops at 60 ºC due to complete denaturation of body enzyme Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (619) Question : An experiment was carried out to show the effect of temperature on the action of pepsin. The table below shows the contents in test tubes M, N, O, P and the temperatures of the different solutions. The results obtained were then plotted as shown in the graph. The fixed variables are enzyme concentration, substrate concentration and volume of starch suspension. Which of the following graphs I, II, III or IV shows the results of the experiment obtained after 10 minutes? A. A B. B C. C D. D Answer : D Reason: An experiment was carried out to show the effect of temperature on the action of pepsin. The table below shows the contents in test tubes I, II, III, IV and the temperatures of the different solutions. The results obtained were then plotted as shown in the graph. The fixed variables are enzyme concentration, substrate concentration and volume of starch suspension. The results shows of the experiment obtained after 10 minutes Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (620) Question : Where there is an excess of substrate, which graph represents the effect of increasing concentration of enzyme on the rate of reaction? A. A B. B C. C D. D Answer : D Reason: Increasing enzyme concentration increases the number of active sites available to catalyse the chemical reaction. The rate reaction id directly proportional to the concentration of enzyme, as long as other factors (substrate, temperature and Ph) are not limiting. Where the substance concentration becomes the limiting factor (that is, substrate is in short supply), further increase in enzyme concentration will not increase the rate of reaction Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (621) Question : According to the lock and key hypothesis, which is the lock and the key for enzyme rennin? A. A B. B C. C D. D Answer : D Reason: The lock and key mechanism propose that the substrate molecule fits into the active site of the enzyme molecule in the same way that a key fits into a lock. The substrate represents the â€Å"key† and the enzyme, the â€Å"lock†. Rennin is used to coagulate milk proteins in cheese production. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (622) Question : Fresh pineapple juice contains the enzyme protease. A petri dish containing lactose-free milk agar is prepared. Four wells are made in the milk agar. Each well is filled with a different solution as shown in the diagram. The petri dish is incubated in an oven at 37 °C. Which wells are surrounded by a clear region after 3 hours? A. 1 and 4 B. 2 and 3 C. 3 and 4 D. 2, 3 and 4 Answer : B Reason: Fresh pineapple juice contains the enzyme protease. A petri dish containing lactose-free milk agar is prepared. Four wells are made in the milk agar. Each well is filled with a different solution as shown in the diagram. The petri dish is incubated in an oven at 37 °C. Wells 2 and 3 are surrounded by a clear region after 3 hours. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (623) Question : Certain blue-green bacteria can live in hot springs because A. they remain in the cyst form B. the bacterial enzymes are denatured C. the bacterial enzymes have optimal temperatures of 70 °C or higher D. they have thick vesistant cell wall Answer : C Reason: Certain blue-green bacteria can live in hot springs because the bacterial enzymes have optimal temperatures of 70 °C or higher Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (624) Question : The diagram shows the mechanism of an enzyme-controlled reaction. Which of the molecules P, Q, R, or S represents the enzyme? A. P B. Q C. R D. S Answer : B Reason: The diagram shows the lock-and-key hypothesis to explain mechanism of enzyme action. Substrate molecule P acts as the â€Å"key† and enzyme molecule Q acts as the â€Å"lock†. Molecule Q is the enzyme molecule Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (625) Question : The diagram shows the mechanism of enzyme action. Which property of enzyme is shown in the diagram? A. Enzyme structure is denatured by extremes of pH. B. Temperature affects the rate of enzyme reaction. C. Enzyme reaction is non-specific. D. Structure of enzyme remains unchanged at the end of the reaction. Answer : D Reason: More extreme changed in pH not affect enzyme activity temporarily and the unchanged. The diagram above that structure of enzyme remains unchanged at the end of the reaction Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (626) Question : The active site of an enzyme is A. identical to its substrate B. identical to the active sites of other enzymes C. complementary to its substrate D. denatured at the end of a chemical reaction Answer : C Reason: The enzyme name is derived by adding the suffix ase at the end of the name of its substrate. Each enzyme has aprecise three dimensional shape with a groove called the active site that is complementary to its substrate Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (627) Question : Catalase is an enzyme that catalyses the breakdown of hydrogen peroxide to release oxygen and water. 2H2O2 > 2H2O + O2 Hydrogen peroxide is toxic if allowed to accumulate in the tissues. Tissues that are metabolically active produce more catalase. An experiment is set up as shown in the diagram. In which test tube would gas bubbles be released most rapidly? A. A B. B C. C D. D Answer : B Reason: In test tube B which have small chicken liver piece and 10cm3 hidrogen peroxide would gas bubbles be released most rapidly. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (628) Question : How many chemical components of carbohydrates in the cells? A. 4 B. 5 C. 6 D. 7 Answer : A Reason: Carbohydrates, proteins and lipids are important component in the cells. There are four types of carbohydrates which are glucose, starch, glycogen and cellulose. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (629) Question : Which of the following are consequences of deficiency for cellulose? I. Muscles cannot contract II. Low levels of antibodies resulting in low immunity against diseases III. No coordination of cellular activities IV. Plasma membrane not formed A. I only B. I and III only C. I, II and III D. I, II, III and IV Answer : A Reason: Carbohydrates, proteins and lipids are important component in the cells. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (630) Question : Which of the following are type of chemical component that low rate of respiration? I. Glucose II. Starch III. Glycogen IV. Cellulose A. I only B. I and III only C. I, II and III D. I, II, III and IV Answer : A Reason: Carbohydrates, proteins and lipids are important component in the cells. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (631) Question : Which of the following cannot transport oxygen by red blood cells? A. Proteins B. Haemoglobin C. Membrane proteins D. Enzymes Answer : B Reason: Carbohydrates, proteins and lipids are important component in the cells. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (632) Question : Which of the following will decrease the respiratory rate in carbohydrates? A. Water B. Intercellular C. Energy D. Deficiency Answer : D Reason: Deficiency in carbohydrates will decrease the respiratory rate and insufficient energy is produces for cellular activities. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (633) Question : Which of the following are biochemical reactions in the cells proceeding at a rate? A. Lack of enzyme results B. Extracellular enzyme C. Intercellular enzymes D. Enzyme catalysed Answer : A Reason: Lack of enzymes results in biochemical reaction in the cells proceeding at a rate too slow to sustain life action. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (634) Question : Which of the following formation of plasma membranes? A. Deficiency in enzyme B. Deficiency in proteins C. Deficiency in lipids D. Deficiency in carbohydrates Answer : C Reason: Deficiency in lipids prevents formation of plasma membranes and absorption of vitamins A, D, E and K. Form : Form 4 Topic : Chemical Composition Of The Cell Bil : (635) Question : Which of the following will cause stunted growth? A. Deficiency in enzyme B. Deficiency in proteins C. Deficiency in lipids D. Deficiency in carbohydrates Answer : B Reason: Deficiency in proteins will cause stunted growth Form : Form 4 Topic : Cell Division Bil : (636) Question : Which of the following are the correct sequences of stages in interphase? A. G1 phase > G2 phase > S phase B. G1 phase > S phase > G2 phase C. S phase > G1 phase > G2 phase D. S phase > G2 phase > G1 phase Answer : B Reason: Interphase occurs before mitosis. The chromosomes are elongated, thin threads called chromatin. They are difficult to see under the light microscope. Interphase can be divided into 3 phases: G1 phase > S phase > G2 phase Form : Form 4 Topic : Cell Division Bil : (637) Question : o The cell grows rapidly in size o There is high metabolic rate, synthesis of proteins and cellular organelles The processes above occur in which stage of interphase? A. M phase B. S phase C. G2 phase D. G1 phase Answer : D Reason: Interphase occurs before mitosis. The chromosomes are elongated, thin threads called chromatin. They are difficult to see under the light microscope. Interphase can be divided into 3 phases: G1 phase, S phase and G2 phase. G1 phase also known as growth phase I. G1 cells have high metabolic rate and synthesis of proteins and cellular organelles occurs. The G1 phase cell growth rapidly in size. Form : Form 4 Topic : Cell Division Bil : (638) Question : Which of the following is not true about cancer? A. It is caused by uncontrolled mitosis B. It may be caused by a mutation in a gene or genes C. It is a class of diseases characterised by benign tumours D. Exposure to ultraviolet light and X-rays may increase the risk of contracting cancer Answer : C Reason: Cancer is caused by uncontrolled mitosis. It may be caused by a mutation in a gene or genes. Benign tumours usually grow slowly and are not cancerous. They are localized lumps of cells and generally do not invade adjacent tissues or spread to other side. Exposure to ultraviolet light, ionizing radiation and X-rays may increase the risk of contracting cancer. Form : Form 4 Topic : Cell Division Bil : (639) Question : Which of the following statements is not true? A. Mitosis produces daughter cells genetically identical to each other B. Cytokinesis is the synthesis of new cytoplasm C. Clones are genetically identical cells D. Meiosis occurs during the formation of gametes Answer : B Reason: Form : Form 4 Topic : Cell Division Bil : (640) Question : How many cells are produced by a zygote which undergoes a series of six mitotic divisions? A. 6 B. 12 C. 32 D. 64 Answer : D Reason: The mitotic phase (M phase) includes mitosis and cytokinesis. During mitosis, the nucleus, containing the duplicated chromosomes, divided to form two daughter nuclei. During crytokinesis the cell crytoplasm divides into two. Cell division occurs that is, the parent cell divides into two daughter cells. Each daughter cell then enters into interphase. 64 cells are produced by a zygote which undergoes a series of six mitotic divisions Form : Form 4 Topic : Cell Division Bil : (641) Question : An animal somatic cell has a diploid number of 24 chromosomes. What is the number of chromosomes in a sperm and a liver cell of the same animal? A. A B. B C. C D. D Answer : B Reason: An animal somatic cell has a diploid number of 24 chromosomes. In a sperm have 12 chromosomes and a 24 liver cell of the same animal Form : Form 4 Topic : Cell Division Bil : (642) Question : The bar chart shows the amount of DNA present in a somatic cell of an animal at different stages of mitosis. How many DNA units would be present in the nucleus of one cell of this animal at the end of the first meiotic division? A. 0 B. 2 C. 4 D. 8 Answer : B Reason: Mitosis is a continuous process. However, for purpose of discussion, it usually divided into four main stages. There are prophase, metaphase, anaphase and telophase. Telophase are the two sets of chromosomes have separated and have reached the opposite poles of the cell. So, the bar chart shows the amount of DNA present in a somatic cell of an animal at different stages of mitosis. Two DNA units would be present in the nucleus of one cell of this animal at the end of the first meiotic division Form : Form 4 Topic : Cell Division Bil : (643) Question : The diagram represents the life cycle of a flowering plant. At which stage does mitosis occur? A. A B. B C. C D. D Answer : D Reason: The diagram represents the life cycle of a flowering plant. Mitosis occur from zygote to flowering plants. Form : Form 4 Topic : Cell Division Bil : (644) Question : The diagram shows movements within a cell during mitosis. What do the three curves represent? A. A B. B C. C D. D Answer : B Reason: In the metaphase in plant cell, the centromeres of most plants do not have a pair of centrioles poles of the spindle fibre. The centromeres of the chromosomes and the poles of the spindle fibres. Each chromosomes consisting of two sister chromatids is attracted by the centromere to a spindle fibre. At the end of metaphase, each centromere divides into two. Form : Form 4 Topic : Cell Division Bil : (645) Question : Which of the following are the similarities between mitosis and cytokinesis in animal cells and plant cells? I. the cells go through prophase, metaphase, anaphase and telophase II. have a pair of centrioles within their centrosomes III. Occurs in certain types IV. centrosomes of most do not have a pair of centrioles A. I only B. I and III only C. I, II and III D. I, III and IV Answer : A Reason: The similarities between mitosis and cytokinesis in animal cells and plant cells are: i. Both animal and plant cells go through prophase, metaphase, anaphase and telophase ii. Each parent cell divides once to produce two daughter iii. The daughter cells have the same number of chromosomes and are genetically identical to the parent cell. Form : Form 4 Topic : Cell Division Bil : (646) Question : The diagram shows a chromosome after DNA replication. Which of the following are consist of it? I. two sister chromatids II. centromere III. one chromatid IV. Chromatin A. I only B. I and III only C. I, II and III D. I, II, III and IV Answer : C Reason: The diagram shows a chromosome after DNA replication seen during prophase. It is seen to consist of two sister chromatids joined at the centromere. Sister chromatids and centromere are in one chromatid Form : Form 4 Topic : Cell Division Bil : (647) Question : Which of the following is not a difference between Meiosis I and Meiosis II? A. A B. B C. C D. D Answer : A Reason :3 Form : Form 4 Topic : Cell Division Bil : (648) Question : A dye commonly used to stain chromosomes in cells of onion root meristems is A. eosin B. aceto-orcein C. iodine D. methylene blue Answer : B Reason: A dye commonly used to stain chromosomes in cells of onion root meristems is aceto-orcein Form : Form 4 Topic : Cell Division Bil : (649) Question : The diagram shows a chromosome at Prophase I, meiosis. What are structures P and Q? A. A B. B C. C D. D Answer : A Reason: The diagram shows a chromosome at Prophase I in meiosis It is seen to consist of two sister chromatids joined at the centromere. Form : Form 4 Topic : Cell Division Bil : (650) Question : The diagram shows the longitudinal section of a flower. Where does meiosis occur in the flower? A. 1 and 2 only B. 2 and 3 only C. 2 and 4 only D. 3 and 4 only Answer : C Reason: The diagram shows the longitudinal section of a flower. Meiosis occur in the flower are at pollen mother cells and embryo sac mother cell. Pollen mother cells in the another undergo meiosis to produce microspores that develop into pollen grains. The embryo sac mother cell in the ovule undergoes meiosis to produce four megaspore, one of which is the origin of the egg cell Form : Form 4 Topic : Cell Division Bil : (651) Question : Which of the following is not a difference between mitosis and meiosis? A. A B. B C. C D. D Answer : A Reason: Form : Form 4 Topic : Cell Division Bil : (652) Question : Which of the following are true about interphase? I. occurs before Meiosis I II. cell size is increases III. replication of DNA occurs IV. the centrioles replicate A. I only B. I and III only C. I, II and III D. I, II, III and IV Answer : D Reason: Interphase are: i. Occurs before Meiosis I ii. The cell increase in size iii. Replication of DNA occurs.There is duplication of chromosomes iv. The centrioles replicate Form : Form 4 Topic : Cell Division Bil : (653) Question : What is an example of polyploidy? A. Fertilisation B. Meiosis C. The tetraploid condition D. Mitosis Answer : C Reason: The tetraploid condition is an example of polyploidy. Polyploidy is the condition where organisms have more than a diploid number of chromosomes Form : Form 4 Topic : Cell Division Bil : (654) Question : Which of the following are rare in animal? A. Polypoidy B. Polyploidy C. Haploid D. Mitosis Answer : B Reason: Polyploidy cannot be sustained and is rare in animal. Offspring are usually not viable and are aborted. Hence, it is very important to maintain the diploid chromosomal number from generation to generation to support life. Form : Form 4 Topic : Cell Division Bil : (655) Question : Which of the following are types of cells undergo meiosis? I. In the human testis II. In the human ovary III. In flowering plant IV. In fruit plant A. I only B. I and III only C. I, II and III D. I, II, III and IV Answer : C Reason: There are three types of cells undergo meiosis. There are in the human testis (the male reproductive organ that produce sperm), in the human ovary (the female reproductive organ that produce ova) and in flowering plants Form : Form 4 Topic : Cell Division Bil : (656) Question : How many haploids sets of chromosomes are created? A. 1 B. 2 C. 3 D. 4 Answer : B Reason: Chromosomes arrive at the poles, elongate and become long, thin chromaytin threads again. Two haploids sets of chromosomes are created Form : Form 4 Topic : Cell Division Bil : (657) Question : Which of the following is as chiasmata? A. Meiosis occurs B. Mitosis occurs C. Crossing-over occurs D. Polyploidy occurs Answer : C Reason: Crossing-over occurs. There is exchange of segments of genetic material between non sister chromatids within a pair of homologous chromosomes. Crossing-over at site knows as chiasmata Form : Form 4 Topic : Cell Division Bil : (658) Question : Which of the following are called a tetrad?

Libertarianism Essays -- essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚   Successful Love   Ã‚  Ã‚  Ã‚  Ã‚  How can couples have successful love? Very seldom do couple start a loving relationship, and keep loving each other. Most relationships go down the drain usually between six months to two years. In the beginning, relationships are new, exciting, and passionate. After some time passes, things change and everything becomes predictable. When this happens, partners get sick of each other and start to fight and argue with each other. Basically, you just get on each others’ nerves. Authors Deborah Tannen, John Gray, Susan Page, and John Gottman explain certain solutions to have successful love. These authors have experience in analyzing relationships. Tannen is a linguistics professor at Georgetown University, specializing in language and communications. Gray is an inspirational writer on relationships. Page has done much work in workshops specializing in relationships and communications. Finally, Gottman is a psychology professor, who has done research on relati onships between two thousand married couples. They all mention that in order to keep a strong relationship, there are particular skills that you need to know. For men and women to successfully communicate, they must be able to listen to each other, understand each other, and not criticize one another. You must have these components to make a relationship successful.   Ã‚  Ã‚  Ã‚  Ã‚  Listening is one of the most important aspects of successful communication between men and women. Listening is the act of paying attention in order to hear one another. When couples communicate, they usually think about talking instead of listening, even though â€Å"98% of good communication is listening.† (Page,28)Page states, â€Å"Listening means putting yourself in the other person’s shoes. It means trying to understand a different point of view before you try to make yourself understand. (Page,28) This explains the fact that what you are saying to someone may mean something totally different than what you wanted to say. To stay away from this problem you must speak as if you were listening. In other words, you have to hear the words that you are saying before they come out of your mouth. â€Å"To some people listening is a highly refined skill that is reserved for deep, intimate conversations or delicate negotiations.† (Page,28) To othe r pe... ...e him for who he is and the things he does for you.† (42) On the other hand, Tannen and Gray agree that you must be positive.   Ã‚  Ã‚  Ã‚  Ã‚  As you can tell, there are many tips to have a great relationship. After reading the authors’ essays, I have learned what to do and what not to do in a relationship. So next time my boyfriend starts to drift away, I will handle it differently. Instead of getting upset and crying because he doesn’t want to be with me; I will just let him be. I can understand that â€Å"he is going into his cave† and wants to be left alone. I will realize that it isn’t my fault. (Gray, 21) As author Deborah Tannen discusses the differences between men and women, she says â€Å"different perspectives on expressing or concealing dissatisfactions and doubts may reflect a difference in men’s and women’s awareness of the power of their words to affect others.† (15) If you are in a relationship and you want it to be successful, make sure that you listen to your partner, you understand men and women’s communication differences, and ne ver criticize-just compliment. If you work on these elements, you will achieve â€Å"Successful Love.†

Abortion: Pro Choice View :: essays research papers

Abortion: Pro Choice View Abortion is a growing issue in America among women and their right to reproduce children. Approximately one to three million abortions are done each year. Women get abortions for many reasons such as for rape, teen pregnancy and health reasons.   Ã‚  Ã‚  Ã‚  Ã‚  Rape is one of many reasons that cause women to choose abortion to end their pregnancies. What to do about their pregnancy is mandatory, although many or them felt they were ending a life. They are wise enough to know how they would treat their illegitimate child. They hate their rapist, and worry that if they kept their babies, they would hate their children for reminding them of such a painful time.   Ã‚  Ã‚  Ã‚  Ã‚  Young women between 15 and 19 account for at least 5 million abortions every year -- 1 million of them in the United States. In fact, one of every five pregnancies happens to a teen-age girl. In situations like this, some people are sure that they could take care of the child, while others know that they aren't ready or mature enough to take so much responsibility. In many cases the child would have no one to rely on but a single mother with no schooling, and maybe a non-supportive family. He or she would have a twisted, miserable upbringing, left vulnerable later in life.   Ã‚  Ã‚  Ã‚  Ã‚  Another reason that causes women choice abortion is health problem. There is a range of problems, including the child being born with Down's Syndrome, Cystic Fibrosis, or a disposition to obesity, which can later in life cause clogged arteries and heart failure.

Structure of the eye and ear :: essays research papers

Structures of the eye and ear We use our ears for the hearing sense, and we use our eyes for vision. Both are very important senses and would be hard to get along without. We rely on hearing for communication, navigation, entertainment and many other purposes Now for our eyes we use them for vision, their like our own personal camera’s, both have and use lens to focus on images. The eyes respond to the visible spectrum, this spectrum is made up of wavelengths of different sizes. The shorter waves produce a purple color, while Longer wavelengths produce blue, yellow, green and orange, and the longest Waves are red. Saturation, brightness, and hue all are components used in the Visible spectrum. More than half of the sensory receptors in the body happen to be located in the eyes, also the cerebral cortex plays a large role in processing Visual information. Some accessory structures of the eye are: the eyelids, eyelashes, eyebrows, Lacrimal apparatus, and the extrinsic eye muscles. The eyelids or (palpebrae) Are used for shade, whether it’s for sleeping or from excessive light, or from foreign objects that don’t belong in the eye. While the eyelids are protecting The eye it also helps at the same time by spreading lubricates over the eyeballs. The eyelashes help protect from foreign objects and perspiration, as well do the Eyebrows . The Lacrimal apparatus is a group of small structures, when humans Express emotions with tears, the Lacrimal apparatus helps to produce and then Drain those tears away. There are six extrinsic eye muscles to help move each Eye; the superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique and inferior oblique. Circuits in the brain stem and cerebellum tell these muscles what to do. The structure of the eye begins with the fibrous tunic, vascular tunic And the retina. These are all on the wall of the eyeball, the fibrous tunic consist of the cornea and the sclera. The cornea is what covers the iris, and is the outermost layer of the eye through which light passes. The sclera or the â€Å"white† of the eye, this is what gives form to the eyeball. The vascular tunic has three parts to it; the choroids, ciliary body, and the iris. The choroids is what provides nutrients to the surface of the retina. The ciliary body consist of ciliary muscle and the iris which is the colored part of the eye, it regulates the amount of light

The Bermuda Triangle

â€Å"Only God and the Sea knows what happened to those great ships†- U. S. President Woodrow Wilson . By this quote Woodrow Wilson argues that while having so many incidents over the pass century within the area of the Bermuda Triangle; many people make inferences on what they believe is true , but no one actually knows the truth behind it all . The Bermuda Triangle is a triangular area of the North Atlantic Ocean and it lies between Miami ,Florida; San Juan, Puerto Rico, and of course the Island of Bermuda. The Bermuda Triangle is 140,000 Sq. miles in size . (Paranormal Encyclopedia . om) The Bermuda Triangle has become a controversial issue world wide. The Bermuda Triangle is a social issue due to: The history of it, Paranormal Activity, and how it has effected people in strange ways. . The Bermuda Triangle was first discussed by Christopher Columbus in the late 15th century . Christopher Columbus first wrote about it in a journal entry in 1492. He wrote that . â€Å" A Gr eat flame of fire crashed into the sea one night and that a strange light appeared a few weeks later. †After hearing this story many people thought it was a meteor and left the story alone for years and years.In 1918 when a Navy seal ship; the Cyclops with 300 men aboard and 10,000 tons ore on board sank somewhere between Barbados and Chesapeake Bay. However, the ship never sent out an SOS distress call. ( â€Å"But the region didn't get its name until August 1964, when Vincent Gaddis coined the term Bermuda Triangle in a cover story for Argosy magazine about the disappearance of Flight 19. †) The disappearance– of the aircraft (Flight 19) was flown by Amelia Earhart from Fort Lauderdale to start her (Around the World journey) but was never completed because in 1965 her plain had circumnavigation and disappeared within the Bermuda Triangle area.Strange history waled to the Bermuda Triangle has also led to many nicknames and paranormal theories. The Bermuda Triang le has many different names such as : â€Å"The Twilight Zone†, â€Å"Port of Missing Ships†, â€Å"Hoodoo Sea†, â€Å"Triangle Of Death†, â€Å"and â€Å"Limboo Of the Lost† but the most famous name is â€Å"The Devil's Triangle,†(TDT). They call it that because many people came up with the theory that the devil is at play and has a lot to do with the deaths within the Bermuda Triangle area.However others think that it's a black hole sucking the ships into another dimension or others theories state that the lost city of Atlantis and possibly UFO's (Unidentified Flying Object) have a lot to do with the disappearances. Many people have different answers but who are we to say if it's true or not . There has been record of proof to show that someone has survived a wreck in the Bermuda Triangle. People pass through The Bermuda Triangle everyday and come home alive (Cary Gordon) her plane lost control when flying over the Bermuda Triangle and sh e was able to control the plane and land it in Miami in 2007.There is still unknown information left unsolved about the Bermuda Triangle and many people are willing to continue their research until they find out the real mystery of the Bermuda Triangle. There has been stories of how the Bermuda Triangle has affected people in a lot of ways like in a book based on the Bermuda Triangle (â€Å"Secrets and Mysteries of the World†)- Author Sylvia Brown wrote that â€Å" My doctor friend reported seeing a pyramid crystal on the top under the water. He tried to get closer to it but was repelled by what seems to be an electric force that went through his body and apparently cured his cancer. In conclusion the Bermuda Triangle has been a social justice issue due to: paranormal activity; the history of it; and how it has effected people in many ways. The Bermuda Triangle is one of the most famous phenomena in history to have as many disappearances ;ship and plane wrecks in the history of wrecks. The Bermuda Triangle will be discussed for years to come due to it's controversy and many different theories. To the mystery is still left unsolved and still will be forever unknown until it has been solved.

Back in Shakespeare Essay

Back in Shakespeare’s days courtly love was a fashionable tradition. What happened was the men saw the women as Goddesses but their love was more often unrequited. But the men would send them love letters in the form of sonnets in order to win the woman’s love, however it usually failed leaving the man feeling melancholic. This is the position Romeo found himself in as he was in love with a girl called Rosaline. Montague and Benvolio notice a change in Romeo’s behaviour due to this and Montague explains how he â€Å"shuts up his windows† and â€Å"locks fair daylight out† this shows that Romeo attempts to isolate himself from the outside world and really is depressed. As Romeo enters the scene the audience can see for themselves his state of mind during his conversation with Benvolio. His replies to Benvolio’s comments are short and subdued and he explains, â€Å"sad hours seem long†. We can work out from this that Romeo is not having a good time so our sympathy wins him over and we hope for his luck to change. As we move onto scene 2, we meet Paris, who is a man hoping to marry Juliet and is trying to convince Capulet to allow him to, however Capulet seems to think Juliet is too young for marriage as â€Å"She hath not seen the change of fourteen years†. The possible marriage between Paris and Juliet is exciting for the audience yet it is an obstacle between the forthcoming relationship between Romeo and Juliet. The scene then cuts back to Romeo and his problems with courtly love. Benvolio who is aware of Romeo’s problem tries to be a useful friend by giving him advice. His advice is â€Å"one fire burns out another’s burning†, this is a metaphorical way of putting; you should find someone else and forget about Rosaline. Then as ‘Clown’ from the Capulet family is struggling to read a party invitation he asks Romeo and Benvolio to read the list out for him. Romeo notices that Rosalie’s name is on this list and the pair therefore decide to find a way of going to the ‘masqued ball’ to give Romeo a chance of fore filling his dream of meeting Rosaline. The fact it’s a masqued ball means they can get in whilst in disguise and probably get away with it and this thought enters Benvolio’s head. In scene 3 we meet the Nurse. A nurse is the Elizabethan equivalent to a child minder, however in these days they were hired out commonly by wealthy upper class families and were pretty much part of the family, they would raise the children and even breast feed them when they are babies. This particular Nurse raised Juliet and the two of them are very close. She is a bubbly character who often tells sexual jokes or sexual innuendo’s and tells Juliet stories about when she was younger usually embarrassing her. From seeing the play myself I remember the nurse being an entertaining character and was an audience favourite which was most noticeable by the applause she got at the end. Her sexual humour is shown where she says, â€Å"dost thou fall upon thy face? Thou wilt fall backward when thou hast more wit, wilt thou not, Jule?† This is a crude joke of falling onto her back for sex and most fourteen year olds would find an adult talking to them like this terribly embarrassing yet the audience find it comical and entertaining. Soon after; Juliet discovers Paris’s desire to marry her and to the nurses delight Juliet replies â€Å"It is an honour that I dream not of†. Again the audience are excited by what is now a probable marriage yet it also questions the possibility of Romeo and Juliet getting together. Whilst on their way to the Capulet masqued ball Romeo predicts the future when saying â€Å"for my mind misgreaves some consequence, yet hanging in the stars†, similarly to what it says in the prologue; Romeo is saying he fears an unfortunate accident. The audience therefore semi-expect this to ironically happen. This is meant to create tension especially when he says about an â€Å"untimely death†, which along with the prologue suggests young death. Scene 5 is set in the Capulet household as it is the location of their ‘masqued ball’. A ‘masqued ball’ was a fashionable party to have in Elizabethan times where everyone went disguised in a mask. It was the equivalent to what a fancy dress party is today and this is why the Montague’s were able to get in with little suspicion from the Capulet’s. Party’s are always a popularity and so Shakespeare made this scene a key one in the play for the entertainment of the audience. From what the audience have seen so far, Romeo is a melodramatic isolated character. He has won over our sympathy and as he is one of the main characters we all want to see things turn around for him. The reason Shakespeare presents him as a melancholic lover is to emphasise the artificial nature of his love for Rosaline in comparison to the genuine emotion he feels for Juliet. We witness the two types of love juxtaposed and recognise that his love for Juliet is positive, energising and less of a ‘pose’. But by presenting him in love with someone else initially, it creates romantic suspense for the audience. When Romeo first sees Juliet, it is described as ‘love at first sight’, this really helps to emphasise how he feels about her. From the audiences point of view, Romeo appears to be shocked by how much Juliet stands out by the way he says â€Å"O she doth teach torches to burn bright†, the reason he says ‘O’ at the start of his speech is purely to emphasise his emotion. The speech as a whole is a type of light imagery and explains how her beauty stands out so much to Romeo. He then goes on to say â€Å"†¦she hangs upon the cheek of night / As a rich jewel in an Ethiops ear†, this is a metaphorical way of saying that she is beautiful, precious and rare to him as is â€Å"Beauty too rich for use†. These are both examples of wealth imagery. The majority of his speech in this part of the scene is imagery and metaphorical to help stress his feelings for Juliet, he also claims she â€Å"Shows a snowy dove trooping with crows†. This is in the category of bird and colour imagery and helps to stand out the point that she really does stand out from the crowd. As explained by courtly love, it was a common thing for men to respect women like they are goddesses, and Romeo uses this kind of ‘holy imagery’ when he says â€Å"†¦touching hers, make blessed my rude hand†. Overall the speech shows strong romantic inte rest due to how Romeo is so intense, passionate and genuine. This is one of the most loving parts of the story; however it is interrupted as the fiery character of Tybalt notices that a Montague is present. He clearly shows his anger by referring Romeo as a â€Å"slave†, which is saying that Romeo is like his inferior. As Capulet enters the scene; Tybalt threatens to â€Å"strike him dead†, however, Capulet bears in mind what the Prince said, in that any more fighting would mean their â€Å"lives would pay the forfeit† and as he wants no violence at the party, he aggressively prevents Tybalt from making any wrong moves. The hatred is then interrupted by the love of Romeo and Juliet as they meet and talk for the first time. Their conversation is set out in the style of a sonnet as of course; these were popular in the Elizabethan and Medieval times. It is very poetic, passionate and filled with religious imagery. The language is intense, memorable and uses rhyming couplets at the end of every other line to help it to sound better and stand out. Juliet is very responsive to Romeo’s requests and appears to want Romeo to kiss her, which was a rarity in the courtly love tradition. Romeo flirtatiously refers to Juliet as a ‘Pilgrim’; this shows how he respects her like a Goddess and this is the start of a large amount of religious imagery. In addition to that, Juliet answers back with her own religious metaphors like â€Å"And palm to palm is holy palmers kiss† this also contains some alliteration due to the repetitive use of words containing ‘palm’. The speech overall is a pattern of Romeo flirting to Juliet and Juliet flirting back, this keeps the flow of the conversation going and on a couple of occasions we witness a kiss. All this comes to a sudden end as the Nurse enters the scene and they discover each others identity. The nurse calls Juliet to go to her mother and when she is gone explains to Romeo â€Å"Her mother is the lady of the house† and of course Romeo realises this is the Capulet house. Benvolio calls Romeo away from the scene explaining â€Å"The sport is at the best† which informs that he knows the best part of the night is over and their identity has been discovered. This means that the Montague’s have to make a swift exit effectively making Romeo and Juliet’s ‘moment’ short with a sudden end. This leaves the nurse and Juliet alone together. Juliet finds out from the Nurse that Romeo is in fact a Montague and is clearly devastated by this when she says â€Å"My grave is like to be my wedding bed† and â€Å"My only love sprung from my only hate. All the way throughout this scene; Shakespeare juxtaposes love and hate. The first sight of love is at Romeo’s first glimpse of Juliet and the whole ‘love at first sight’ event, this is interrupted by Tybalt noticing Romeo and wanting to cause a violent act but he is stopped by Capulet. This allows Romeo and Juliet to have their first speech in the form of the love sonnet although when the two realise each other’s identity, the hate between the two families takes over leaving the audience wondering if the power of their love is strong enough to overcome the hate. In conclusion to the opening act of the play; Shakespeare creates many ‘untied’ ends to the story. This makes the audience want to carry on watching to get an answer to their questions; questions such as will Tybalt fore fill his threat towards Romeo? Are Romeo and Juliet going to die and if so how? Will Paris marry Juliet? And will there be any more fighting? The only possible way for the audience to find an answer to these questions is to carry on watching the play. This was Shakespeare’s objective for the opening act and he has therefore successfully completed it.