Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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At equilibrium,
a. | the rate of the forward and backward reactions are equal. | b. |  G=0 | c. | the forward and backward reactions have stopped. | d. | a reaction is no
longer spontaneous. |
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2.
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When a substance A was added to an enzyme reaction,
product formation decreased. The addition of more substrate did not increase product formation. From
this we conclude that substance A
a. | could be a cofactor | b. | has a  G of -7.3 kcal/mol | c. | could be a noncompetitive inhibitor. | d. | could be a competitive inhibitor. |
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3.
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In an experiment, changing the pH from 7 to
6 increased product formation. This means
a. | the enzyme was a more active conformation at pH
6. | b. | this enzyme works best at a neutral
pH. | c. | the temperature
must have decreased when the pH was changed. | d. | None of the above
is correct. |
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4.
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When you put hydrogen peroxide on an open cut,
which equation describes the reaction most accurately?
a. | H2O2 = H2O +
O2 | b. | 2
H2O2 = 2 H2O + O2 and a protein enzyme helps the
reaction. | c. | 2
H2O22 = 2 H2O + O2 | d. | 2 H2O2 = 2 H2O + 2 O2 and a
protein enzyme helps the reaction |
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5.
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Enzymes
a. | are biological
catalysts | b. | are regenerated
during the reaction | c. | increase reaction
rates. | d. | a, b, c are
correct | e. | none of the above
is correct. |
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