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Unformatted text preview: Version Exam 3 Sathasivan (49750) 1 This print-out should have 42 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points At the end of the first meiotic division, each chromosome consists of 1. four copies of each DNA molecule. 2. a homologous chromosome pair. 3. chiasmata. 4. two chromatids. correct 5. a pair of polar microtubules. Explanation: 002 10.0 points Microtubules that form the mitotic spindle tend to originate from or terminate in 1. centromeres and telomeres. 2. centrioles and kinetochores. correct 3. centrioles and telomeres. 4. euchromatin. 5. the nuclear envelope. Explanation: 003 10.0 points Absorbanceofchlorophyll a Rateofphotosynthesis 400 500 600 700 Violet Blue Green Yellow Orange Red Wavelength of light (nm) The solid line in the given figure shows the absorption spectrum for chlorophyll a and the dashed line shows the action spectrum for photosynthesis. Why the two curves are different? 1. Bright sunlight destroys photosynthetic pigments. 2. Anaerobic bacteria probably interfered with light absorption. 3. The two lines are probably the result of inaccuratemeasurements. 4. Other pigments absorb light in addition to chlorophyll a . correct 5. Green and yellow wavelengths inhibit the absorptionof red and blue wavelengths. Explanation: There are other pigments (carotenoids, etc. ) involved in photosynthesis. 004 10.0 points Arrange the mitotic stages I) metaphase II) prometaphase III) cytokinesis IV) prophase V) telophase VI) anaphase Version Exam 3 Sathasivan (49750) 2 in the correct order. 1. IV, II, I, VI, V, III correct 2. V, I, IV, VI, II, III 3. None of these 4. IV, I, III, VI, II, V 5. I, III, IV, VI, II, V Explanation: Recall 005 10.0 points Which of the following describes the fate of oxygen utilized directly during cellular respi- ration? 1. the citric acid cycle 2. glycolysis 3. the oxidation of pyruvate to acetyl CoA 4. accepting electrons at the end of the elec- tron transport chain correct 5. the phosphorylation of ADP Explanation: The process involves accepting electrons at the end of the electron transport chain. 006 10.0 points The most abundant protein that is also a key regulatory enzyme in photosynthesis is . 1. RubisCO correct 2. carbohydrate synthase 3. phosphofructokinase 4. citrate synthase 5. PEP carboxylase Explanation: 007 10.0 points Conversion of corn sugar to ethanol is an in- efficient process of energy conversion. Louis Pasteur proved that yeast grown under anaer- obic conditions to make ethanol consumed 100 times more sugar than those under aerobic conditions did , because 1. glycolysis does not happen under anaero- bic condition....
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