practice exam 2

practice exam 2 - These questions were taken from previous...

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These questions were taken from previous exams in this course. Answers are given for  about half of them. 1. The chemiosomotic process in chloroplasts involves the a. establishment of a proton gradient. b. diffusion of electrons through the thylakoid membrane. c. oxidation of water to produce ATP energy. d. movement of water by osmosis into the thylakoid space from the stroma. e. reduction of carbon dioxide to glucose by NADPH and ATP. 2. A cell containing 92 chromatids at the start of mitosis would, at its completion, produce cells containing how many chromosomes? a. 12 b. 16 c. 23 d. 46 e. 92 3. Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes? a. the splitting of water b. the absorption of light energy by chlorophyll c. the flow of electrons from photosystem II to photosystem I d. the synthesis of ATP e. the reduction of NADP+ 4. Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. One nucleus had 5 picograms of DNA. What stage of the cell cycle was this nucleus in? a. G0 b. G1 c. S d. G2 e. M 5. The oxygen consumed during cellular respiration is directly involved in a. glycolysis. b. accepting electrons at the end of the electron transport chain. c. the citric acid cycle. d. the oxidation of pyruvate to acetyl CoA. e. the phosphorylation of ADP. 6. Which of the following statements is TRUE concerning catabolic pathways? a. They combine molecules into more complex and energy-rich molecules. b. They are usually coupled with anabolic pathways to which they supply energy in the form of ATP. c. They involve endergonic reactions that break complex molecules into simpler ones. d. They are spontaneous and do not need enzyme catalysis. e. They build up complex molecules such as protein from simpler compounds. 7. Eukaryotic sexual life cycles show tremendous variation. Of the following five elements (I to V), which do all sexual life cycles have in common? (choose one of a - e) I. copulation II. meiosis III. fertilization IV. gametes V. spores a. I, IV, and V b. I, II, and IV c. II, III, and IV d. II, IV, and V e. All of the above
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8. Which of the following statements about the light reactions of photosynthesis is FALSE?
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This note was uploaded on 06/01/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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practice exam 2 - These questions were taken from previous...

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