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CHEM153A_final_L2_W09

CHEM153A_final_L2_W09 - Chem 153A Winter 2009 Final Exam 2A...

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Chem 153A, Winter 2009, Final Exam 2A Answer Sheet 1 (Green) 2/11 1. (1 pt) Write your exam ID ( A ) in the blank at the upper right of your answer sheet. 2. (5 pts) Which of the reactions of a metabolic pathway would you expect to be regulated? List all that apply: a. the 1 st committed step of the pathway b. the last step of the pathway c. a highly spontaneous reaction d. a rate-limiting reaction e. a reaction in which [products]/[reactants] is close to K eq f. a very fast reaction (relative to others in the pathway) g. a reaction with a large, positive ΔE°' h. a reaction involving a phosphoryl transfer from phosphoenolpyruvate i. a reaction that is used in the reverse pathway 3. (3 pts) The reaction X → Y has ΔG°' = -3.7 kJ/mol. If [Y] > [X], which of the following can be concluded? a. the reaction will be spontaneous in the direction written b. the reaction will be spontaneous in the reverse direction c. the reaction is near equilibrium d. the reaction is at equilibrium e. none of the above 4. (2 pts) What metabolite is the first intermediate common to the breakdown of proteins, polysaccharides, and fatty acids? 5. (3 pts) Given the following reactions: Explain why the conversion of B→C would be spontaneous in the cell (30 words or less). 6. (4 pts) Does glucose or ATP act as a nucleophile in the reaction catalyzed by hexokinase? Briefly explain your answer (15 words or less). 7. (3 pts) Which one of the following sets most likely represents amino acids found in the active site of glucosephosphate isomerase?
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Chem 153A, Winter 2009, Final Exam 2A Answer Sheet 1 (Green) 3/11 8. (5 pts) Which of the following catalytic mechanisms are important in the catalytic mechanism of aldolase: 9. (13 pts) Select from the following list of enzymes to answer the questions below: M. pyruvate kinase N. pyruvate dehydrogenase complex O. citrate synthase P. aconitase Q. isocitrate dehydrogenase R. α-ketoglutarate dehydrogenase complex S. succinyl-CoA synthetase T. succinate dehydrogenase U. fumarase V. malate dehydrogenase W. flavoprotein dehydrogenase X. 3-phosphoglycerol dehydrogenase Y. ATP synthase a. Which of these enzymes can bind NADH? b. Which of these enzymes are phosphorylated as part of their catalytic mechanism? c. Which of these enzymes are regulated by phosphorylation? 10. (5 pts) Arrange the following molecules in order of increasing oxidation state.
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Chem 153A, Winter 2009, Final Exam 2A Answer Sheet 1 (Green) 4/11 11. (14 pts) You are studying a new organism, and based on the sequence, you find what you think is the gene for pyruvate dehydrogenase complex enzyme 2 (E 2 ). To test
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