At about \(0^\circ C\) , most enzymes are
1. inactive
2. active
3. destroyed
4. replicated

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 92%

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If an active-site directed inhibitor is present in the medium, the curve that will represent the progress of the chemical reaction will be shown by the letter:

1. D 2. C
3. A 4. B
Subtopic:  Enzyme Inhibition |

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If an non active-site directed inhibitor is present in the medium, the curve that will represent the progress of the chemical reaction will be shown by the letter:

 

1. D
2. C
3. B
4. A

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 52%

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Which of the following will fit in the description of a competitive enzyme inhibitor?
1. a highly reactive compound.
2. a metal ion such as Hg2+ or Pb2+.
3. structurally similar to the substrate.
4. water insoluble.

Subtopic:  Enzyme Inhibition |
 90%
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A non-competitive inhibitor of an enzyme catalyzed reaction
1. binds to the Michaelis complex (ES).
2. increases Vmax.
3. is without effect at saturating substrate concentrations.
4. can actually increase reaction velocity in rare cases.

Subtopic:  Enzyme Inhibition |

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The measurement of which of the following would be indicator of the degree of inhibition by a competitive enzyme inhibitor?
1. Vmax
2. The y-intercept on a Limeweaver-Burke Plot
3. Km
4. ¼ Vmax

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 72%
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An allosteric inhibitor of an enzyme usually
1. binds to the active site.
2. participates in feedback regulation.
3. denatures the enzyme.
4. causes the enzyme to work faster.

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 57%

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A change in an amino acid located distantly from the active site of an enzyme can affect the specificity of the enzyme towards its substrate by:

1. making the enzyme unstable
2. cause a relocation of the enzyme within a cell
3. changing the shape of the protein
4. changing the optimum pH and temperature values for the enzyme
Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 66%

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The property of water that enables it to
stabilize temperature in bodies of organisms
and thus makes it indispensible for life is:
1. High specific heat
2. High latent heat of fusion
3. High latent heat of vaporization
4. High cohesion and adhesion

Subtopic:  Element Analysis |
 67%

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The element that makes up the highest
percent weight of the human body is:
1. Carbon
2. Hydrogen
3. Oxygen
4. Nitrogen

Subtopic:  Introduction |
 65%
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