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JACKLINEbch 3025 exam 3 With Questions And 100% SURE ANSWERS
Terms in this set (203)
If the G'° of the reaction A -> B is -40 kJ/mol, under E) will proceed spontaneously from left to right.
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.
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For the reaction A - B,G'° = -60 kJ/mol. The C) B formation is kinetically slow; equilibrium has not been reached by 24 hours.
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.
When a mixture of 3-phosphoglycerate and 2- A) delta G'° is -4.44 kJ/mol.
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? (R = 8.315 J/mol·K; T =
298 K)
3-Phosphoglycerate 2-phosphoglycerate
A) delta 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.
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When a mixture of glucose 6-phosphate and D) deltaG'° is +1.72 kJ/mol.
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/mol·K; 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) deltaG'° is +1.72 kJ/mol.
E) G'° is incalculably large and positive.
Hydrolysis of 1 M glucose 6-phosphate catalyzed A) deltaG'° = -11 kJ/mol.
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/mol·K; T = 298 K)
A) deltaG'° = -11 kJ/mol.
B) G'° = -5 kJ/mol.
C) G'° = 0 kJ/mol.
D) G'° = +11 kJ/mol.
E) G'° cannot be determined from the information
given.
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The reaction A + B C has aG'° of -20 kJ/mol at C) at equilibrium, the concentration of C will be much greater than the concentration of A or B.
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.
Which of the following compounds has the largest A) Acetic anhydride
negative value for the standard free-energy
change (deltaG'°) upon hydrolysis?
A) Acetic anhydride
B) Glucose 6-phosphate
C) Glutamine
D) Glycerol 3-phosphate
E) Lactose
For the following reaction, deltaG'° = +29.7 kJ/mol. E) may occur in cells at some concentrations of substrate and product
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 whichG'° 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
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