153A_final_L1_W09_answers

153A_final_L1_W09_answers - Chem 153A, Winter 2009 Practice...

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1/3 Practice Final 1 Answer Key 2. a. The enzyme catalyzes the reaction in both directions (for opposing pathways). b. NA, NA c. Yes. The enzyme catalyzes the reaction in only one direction, suggesting it’s highly spontaneous. (Also, this is the pathway’s 1 st committed step.) d. Possible positive effectors: A, H; possible negative effectors: F, G, C e. 5, 6, 7, 8 3. a. True. b. True. c. False; hexokinase is a transferase. d. False; glucokinase is regulated by substrate availability. e. False; although it shows sigmoidal kinetics, glucokinase is a monomeric protein. 4. a. An isozyme is a different enzyme that catalyzes the same reaction . b. False. Glucosephosphate isomerase and triosephosphate isomerase are not isozymes because they catalyze different reactions. 5. a, b, d, e 6. a, b, d, j, m, n, o, p, r, s, t, z 7. a. (homolactic) fermentation lactic acid (lactate) !ote that alcoholic fermentation would not result in a sour taste. b. Because the organism will use aerobic catabolism instead of fermentation if O 2 is present. (Also, O 2 encourages growth of toxic microbes.) 8. a, d 9. d, f, b, a, g, c, e 10. 11. NAD + (The oxidant is the oxidizing agent, or the compound that becomes reduced.) 12. 13. a. ΔE°' = E°' acceptor – E°' donor = +0.82 V – (+0.05 V) = 0.77 V b. ΔG°' = -nFΔE°' = -2(96.5 kJ/V·mol)(0.77 V) = -148.6 kJ/mol c. ΔG°' = -148.6 kJ/mol ≈ ΔG for e - transport from Compl. II → O 2 6 protons pumped: 6 x 20 kJ/mol = 120 kJ per 6 mol protons pumped
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153A_final_L1_W09_answers - Chem 153A, Winter 2009 Practice...

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