MCQ Questions
Q.1.
The following question is based on the reaction A + B ↔ C + D shown in the figure.Which of the following represents the ΔG of the reaction in the figure?
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    D
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    curves 1 and 4
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    A
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    c. exergonic, Δ G < 0
Q.2.
Which of the following statements about feedback regulation of a metabolic pathway is correct?
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    A substrate molecule bound to an active site of one subunit promotes substrate binding to the active site of other subunits.
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    The final product of a metabolic pathway is usually the compound that regulates the pathway.It is quite common that the end product of the pathway controls the overall rate of the pathway
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    The active site can provide heat from the environment that raises the energy content of the substrate.An enzyme cannot extract heat from the environment to speed a reaction. It can only lower the activation energy barrier so that more substrates have the energy to react.
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    The reaction is faster than the same reaction in the absence of the enzyme.
Q.3.
If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to
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    add more of the enzyme.
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    entropy of the universe.
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    It is lost to the environment.
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    exergonic; endergonic
Q.4.
The following question is based on the reaction A + B ↔ C + D shown in the figure.Which of the following terms best describes the forward reaction in the figure?
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    c. exergonic, Δ G < 0
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    curves 1 and 4
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    exergonic; endergonic
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    D
Q.5.
Which of the following statements describes enzyme cooperativity?
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    Enzymes increase the rate of a reaction by lowering the activation energy barrier.
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    A substrate molecule bound to an active site of one subunit promotes substrate binding to the active site of other subunits.
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    The reaction proceeds with a net release of free energy.
Q.6.
The following question is based on the reaction A + B ↔ C + D shown in the figure.Which of the following represents the difference between the free-energy content of the reactants and the free-energy content of the products in the figure?
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    D
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    curves 1 and 4
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    c. exergonic, Δ G < 0
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    A
Q.7.
Which temperature and pH profile curves on the graphs were most likely generated from analysis of an enzyme from a human stomach where conditions are strongly acid?
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    c. exergonic, Δ G < 0
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    curves 1 and 4
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    exergonic; endergonic
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    activation energy.
Q.8.
The following question is based on the reaction A + B ↔ C + D shown in the figure.Which of the following in the figure would be the same in either an enzyme-catalyzed or a noncatalyzed reaction?
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    D
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    c. exergonic, Δ G < 0
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    A
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    curves 1 and 4
Q.9.
Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as _______ is to _______.
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    add more of the enzyme.
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    exergonic; endergonic
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    activation energy.
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    c. exergonic, Δ G < 0
Q.10.
Enzymes are described as catalysts, which means that they _____.
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    The reaction proceeds with a net release of free energy.
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    increase the rate of a reaction without being consumed by the reaction
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    Enzymes increase the rate of a reaction by lowering the activation energy barrier.
Q.11.
Which of the following is NOT a way in which an enzyme can speed up the reaction that it catalyzes?
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    The active site can provide heat from the environment that raises the energy content of the substrate.An enzyme cannot extract heat from the environment to speed a reaction. It can only lower the activation energy barrier so that more substrates have the energy to react.
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    The reaction proceeds with a net release of free energy.
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    The final product of a metabolic pathway is usually the compound that regulates the pathway.It is quite common that the end product of the pathway controls the overall rate of the pathway
Q.12.
A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    the activation energy barrier for this reaction cannot easily be surmounted at room temperature.
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    The final product of a metabolic pathway is usually the compound that regulates the pathway.It is quite common that the end product of the pathway controls the overall rate of the pathway
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    The active site can provide heat from the environment that raises the energy content of the substrate.An enzyme cannot extract heat from the environment to speed a reaction. It can only lower the activation energy barrier so that more substrates have the energy to react.
Q.13.
Which of the following is a statement of the first law of thermodynamics?
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    The reaction proceeds with a net release of free energy.
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    Energy cannot be created or destroyed.
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    They consume energy to build up polymers from monomers.
Q.14.
According to the induced fit hypothesis of enzyme catalysis, which of the following is correct?
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    the activation energy barrier for this reaction cannot easily be surmounted at room temperature.
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    The final product of a metabolic pathway is usually the compound that regulates the pathway.It is quite common that the end product of the pathway controls the overall rate of the pathway
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    The binding of the substrate changes the shape of the enzyme's active site.
Q.15.
The active site of an enzyme is the region that
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    is involved in the catalytic reaction of the enzyme.
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    their enzymes have high optimal temperatures.
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    They consume energy to build up polymers from monomers.
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    The reaction proceeds with a net release of free energy.
Q.16.
When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?
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    It is lost to the environment.
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    exergonic; endergonic
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    add more of the enzyme.
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    entropy of the universe.
Q.17.
Which of the following is true for all exergonic reactions?
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    Enzymes increase the rate of a reaction by lowering the activation energy barrier.
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    They consume energy to build up polymers from monomers.
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    The reaction is faster than the same reaction in the absence of the enzyme.
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    The reaction proceeds with a net release of free energy.
Q.18.
Which of the following statements is true about enzyme-catalyzed reactions?
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    They consume energy to build up polymers from monomers.
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    The reaction proceeds with a net release of free energy.
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    Enzymes increase the rate of a reaction by lowering the activation energy barrier.
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    The reaction is faster than the same reaction in the absence of the enzyme.
Q.19.
Whenever energy is transformed, there is always an increase in the
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    add more of the enzyme.
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    increase the rate of a reaction without being consumed by the reaction
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    It is lost to the environment.
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    entropy of the universe.