Ch. 13 Lehninger biochem test bank | Questions with 100 % correct answers | verified
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Ch. 13 Lehninger biochem
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Ch. 13 Lehninger Biochem
1. If the delta 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 A to B. - E
For the reaction A ---...
Ch. 13 Lehninger biochem test bank 1. If the delta 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 A to B. - ✔✔E For the reaction A --->B, delta 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 de scribed is impossible, given the fact thatG'° is -60 kJ/mol. - ✔✔C The reaction A + B --->C has a delta G'° of -20 kJ/mol at 25° C. Starting under standard conditions, one can predict that: A) at equilibrium, the concentration of B will exceed the concen tration of A. B) at equilibrium, the concentration of C will be less than the concentration of A. C) at equilibrium, the concentration of C will be much greater than the concentration of A or B. D) C will rapidly break down to A + B. E) when A and B ar e mixed, the reaction will proceed rapidly toward formation of C. - ✔✔C Which of the following compounds has the largest negative value for the standard free -energy change (G'°) upon hydrolysis? A) Acetic anhydride B) Glucose 6 -phosphate C) Glutamine D) Glycerol 3 -phosphate E) Lactose - ✔✔A For the following reaction, delta G'° = +29.7 kJ/mol. L-Malate + NAD+ --->oxaloacetate + NADH + H+ The reaction as written: A) can never occur in a cell. B) can occur in a cell only if it is coupled to another reaction for which delta G'° is positive. C) can occur only in a cell in which NADH is converted to NAD+ by electron transport. D) cannot occur because of its large activation energy. E) may occur in cells at some concentrations of substrate and product. - ✔✔E For the reaction A --->B, the Keq' is 104. If a reaction mixture originally contains 1 mmol of A and no B, which one of the following must be true? A) At equilibrium, there will be far more B than A. B) Th e rate of the reaction is very slow. C) The reaction requires coupling to an exergonic reaction in order to proceed. D) The reaction will proceed toward B at a very high rate. E) Delta G'° for the reaction will be large and positive. - ✔✔A
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