Ch. 13 Lehninger Biochem Test Bank Questions And Answers Latest Top Score.
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Ch. 13 Lehninger Biochem
Ch. 13 Lehninger Biochem Test Bank Questions And Answers Latest Top Score.
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 proc...
Ch. 13 Lehninger Biochem Test Bank
Questions And Answers Latest Top Score.
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. - correct answer. 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 described is impossible, given the fact thatG'° is -60 kJ/mol. - correct
answer. 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 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.
E) when A and B are mixed, the reaction will proceed rapidly toward formation of C. -
correct answer. 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 - correct answer. 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. - correct
answer. 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) The 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. - correct answer. A
For the reaction A --->B, the Keq' is 10-6. If a reaction mixture originally contains 1
mmol of A and 1 mmol of B, which one of the following must be true?
A) At equilibrium, there will be still be equal levels of A and B.
B) The rate of the reaction is very slow.
C) At equilibrium, the amount of A will greatly exceed the amount of B.
D) The reaction will proceed toward B at a very high rate.
E) Delta G'° for the reaction will be large and positive. - correct answer. A
In glycolysis, fructose 1,6-bisphosphate is converted to two products with a standard
free-energy change (delta G'°) of 23.8 kJ/mol. Under what conditions encountered in a
normal cell will the free-energy change (delta G) be negative, enabling the reaction to
proceed spontaneously to the right?
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