Multiple Choice Questions

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?
  • D
  • curves 1 and 4
  • A
  • c. exergonic, Δ G < 0
Which of the following statements about feedback regulation of a metabolic pathway is correct?
  • A substrate molecule bound to an active site of one subunit promotes substrate binding to the active site of other subunits.
  • 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
  • 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.
  • The reaction is faster than the same reaction in the absence of the enzyme.
If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to
  • add more of the enzyme.
  • entropy of the universe.
  • It is lost to the environment.
  • exergonic; endergonic
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?
  • c. exergonic, Δ G < 0
  • curves 1 and 4
  • exergonic; endergonic
  • D
Which of the following statements describes enzyme cooperativity?
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • Enzymes increase the rate of a reaction by lowering the activation energy barrier.
  • A substrate molecule bound to an active site of one subunit promotes substrate binding to the active site of other subunits.
  • The reaction proceeds with a net release of free energy.
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?
  • D
  • curves 1 and 4
  • c. exergonic, Δ G < 0
  • A
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?
  • c. exergonic, Δ G < 0
  • curves 1 and 4
  • exergonic; endergonic
  • activation energy.
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?
  • D
  • c. exergonic, Δ G < 0
  • A
  • curves 1 and 4
Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as _______ is to _______.
  • add more of the enzyme.
  • exergonic; endergonic
  • activation energy.
  • c. exergonic, Δ G < 0
Enzymes are described as catalysts, which means that they _____.
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • The reaction proceeds with a net release of free energy.
  • increase the rate of a reaction without being consumed by the reaction
  • Enzymes increase the rate of a reaction by lowering the activation energy barrier.
Which of the following is NOT a way in which an enzyme can speed up the reaction that it catalyzes?
  • 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.
  • The reaction proceeds with a net release of free energy.
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • 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
A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • the activation energy barrier for this reaction cannot easily be surmounted at room temperature.
  • 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
  • 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.
Which of the following is a statement of the first law of thermodynamics?
  • The reaction proceeds with a net release of free energy.
  • Energy cannot be created or destroyed.
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • They consume energy to build up polymers from monomers.
According to the induced fit hypothesis of enzyme catalysis, which of the following is correct?
  • the activation energy barrier for this reaction cannot easily be surmounted at room temperature.
  • 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
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • The binding of the substrate changes the shape of the enzyme's active site.
The active site of an enzyme is the region that
  • is involved in the catalytic reaction of the enzyme.
  • their enzymes have high optimal temperatures.
  • They consume energy to build up polymers from monomers.
  • The reaction proceeds with a net release of free energy.
When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?
  • It is lost to the environment.
  • exergonic; endergonic
  • add more of the enzyme.
  • entropy of the universe.
Which of the following is true for all exergonic reactions?
  • Enzymes increase the rate of a reaction by lowering the activation energy barrier.
  • They consume energy to build up polymers from monomers.
  • The reaction is faster than the same reaction in the absence of the enzyme.
  • The reaction proceeds with a net release of free energy.
Which of the following statements is true about enzyme-catalyzed reactions?
  • They consume energy to build up polymers from monomers.
  • The reaction proceeds with a net release of free energy.
  • Enzymes increase the rate of a reaction by lowering the activation energy barrier.
  • The reaction is faster than the same reaction in the absence of the enzyme.
Whenever energy is transformed, there is always an increase in the
  • add more of the enzyme.
  • increase the rate of a reaction without being consumed by the reaction
  • It is lost to the environment.
  • entropy of the universe.
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Multiple Choice Questions
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