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Chapter 13 Principles of Bioenergetics Multiple Choice Questions 1. Bioenergetics and thermodynamics Page: 492 Difficulty: 1 Ans: E If the G' of the reaction A B is 40 kJ/mol, under standard conditions the reaction: A) is at equilibrium. B) will never reach equilibrium. C) will not occur spontaneously. D) will proceed at a rapid rate. E) will proceed spontaneously from left to right. 2. Bioenergetics and thermodynamics Page: 492 Difficulty: 1 Ans: C For the reaction A B, G' = 60 kJ/mol. The reaction is started with 10 mmol of A; no B is initially present. After 24 hours, analysis reveals the presence of 2 mmol of B, 8 mmol of A. Which is the most likely explanation? A) A and B have reached equilibrium concentrations. B) An enzyme has shifted the equilibrium toward A. C) B formation is kinetically slow; equilibrium has not been reached by 24 hours. D) Formation of B is thermodynamically unfavorable. E) The result described is impossible, given the fact that G' is 60 kJ/mol. 3. Bioenergetics and thermodynamics Page: 492 Difficulty: 2 Ans: A When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25C with phosphoglycerate mutase until equilibrium is reached, the final mixture contains six times as much 2- phosphoglycerate as 3-phosphoglycerate. Which one of the following statements is most nearly correct, when applied to the reaction as written? ( R = 8.315 J/molK; T = 298 K) 3-Phosphoglycerate 2-phosphoglycerate A) G' is 4.44 kJ/mol. B) G' is zero. C) G' is +12.7 kJ/mol. D) G' is incalculably large and positive. E) G' cannot be calculated from the information given. Chapter 13 Principles of Bioenergetics 4. Bioenergetics and thermodynamics Page: 492 Difficulty: 2 Ans: D When a mixture of glucose 6-phosphate and fructose 6-phosphate is incubated with the enzyme phosphohexose isomerase (which catalyzes the interconversion of these two compounds) until equilibrium is reached, the final mixture contains twice as much glucose 6-phosphate as fructose 6- phosphate. Which one of the following statements is best applied to this reaction outlined below? ( R = 8.315 J/molK; T = 298 K) Glucose 6-phosphate fructose 6-phosphate A) G' is incalculably large and negative. B) G' is 1.72 kJ/mol. C) G' is zero. D) G' is +1.72 kJ/mol. E) G' is incalculably large and positive. 5. Bioenergetics and thermodynamics Page: 492 Difficulty: 1 Ans: A Hydrolysis of 1 M glucose 6-phosphate catalyzed by glucose 6-phosphatase is 99% complete at equilibrium (in other words, only 1% of the substrate remains). Which of the following statements is most nearly correct? ( R = 8.315 J/molK; T = 298 K) A) G' = 11 kJ/mol. ... View Full Document

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