Copy of HMD - Introduction to Metabolism If the G of the...

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Introduction to Metabolism If the  Δ 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. For the reaction A    B,  Δ 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 Δ G' ° is –60 kJ/mol. When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25°C  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? ( = 8.315 J/mol∙K;  = 298  K) 3-Phosphoglycerate    2-phosphoglycerate A) Δ G' ° is –4.44 kJ/mol. B) Δ G' ° is zero. ???C)  Δ G' ° is +12.7 kJ/mol. D) Δ G' ° is incalculably large and positive. E) Δ G' ° cannot be calculated from the information given. 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
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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? ( = 8.315 J/mol∙K;  = 298 K) Glucose 6-phosphate    fructose 6-phosphate A) Δ G' ° is incalculably large and negative. B) Δ G' ° is –1.72 kJ/mol. C) Δ G' ° is zero. D)  Δ G' ° is +1.72 kJ/mol. E) Δ G' ° is incalculably large and positive. The reaction ATP    ADP + P is an example of a(n) reaction. A) homolytic cleavage B) internal rearrangement C) free radical D) group transfer E) oxidation/reduction All of the following contribute to the large, negative, free-energy change upon hydrolysis  of “high-energy” compounds  except: A) electrostatic repulsion in the reactant. B) low activation energy of forward reaction.
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This note was uploaded on 06/15/2010 for the course AP 32185 taught by Professor Meher during the Spring '10 term at Acton School of Business.

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Copy of HMD - Introduction to Metabolism If the G of the...

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