Ch. 13 Lehninger biochem test bank
1. 1. If the delta G'° of the reaction A --> B is -40 kJ/mol, E
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.
2. For the reaction A --->B, delta G'° = -60 kJ/mol. The C
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 thatG'° is -
60 kJ/mol.
3. The reaction A + B --->C has a delta G'° of -20 kJ/mol C at
25° C. Starting under standard conditions, one can predict that:
A) at equilibrium, the concentration of B will exceed the
concentration 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.
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, Ch. 13 Lehninger biochem test bank
E) when A and B are mixed, the reaction will proceed rapidly
toward formation of C.
4. Which of the following compounds has the largest A 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
5. For the following reaction, delta G'° = +29.7 kJ/mol. E 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.
6. For the reaction A --->B, the Keq' is 104. If a reaction A
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) The rate of the reaction is very slow.
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1. 1. If the delta G'° of the reaction A --> B is -40 kJ/mol, E
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.
2. For the reaction A --->B, delta G'° = -60 kJ/mol. The C
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 thatG'° is -
60 kJ/mol.
3. The reaction A + B --->C has a delta G'° of -20 kJ/mol C at
25° C. Starting under standard conditions, one can predict that:
A) at equilibrium, the concentration of B will exceed the
concentration 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.
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, Ch. 13 Lehninger biochem test bank
E) when A and B are mixed, the reaction will proceed rapidly
toward formation of C.
4. Which of the following compounds has the largest A 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
5. For the following reaction, delta G'° = +29.7 kJ/mol. E 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.
6. For the reaction A --->B, the Keq' is 104. If a reaction A
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) The rate of the reaction is very slow.
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