Q. No.Almost all enzymes are proteins, but there are some nucleic acids that behave like enzymes. What are these nucleic acid enzymes called?
1. DNases
2. Ribozymes
3. Proteases
4. Lipases
1. DNases
2. Ribozymes
3. Proteases
4. Lipases
Subtopic: Enzymes |
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A general rule of thumb for the rates of physical and chemical processes is that the rate _________ or decreases by half for every _________ change in temperature in either direction.
1. stabilizes, 5°C
2. doubles, 10°C
3. halves, 15°C
4. increases, 20°C
1. stabilizes, 5°C
2. doubles, 10°C
3. halves, 15°C
4. increases, 20°C
Subtopic: Enzymes |
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Which of the following statements is TRUE about enzyme catalysts compared to inorganic catalysts?
| 1. | Enzymes work efficiently at high temperatures and high pressures. |
| 2. | Inorganic catalysts work efficiently at high temperatures and high pressures, while enzymes get damaged at high temperatures. |
| 3. | Both enzymes and inorganic catalysts work efficiently at high temperatures. |
| 4. | Enzymes work efficiently only at low temperatures. |
Subtopic: Enzymes |
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The "active site" of an enzyme is:
| 1. | The sequence of amino acids that forms the enzyme's backbone. |
| 2. | The crevice or pocket where the substrate binds. |
| 3. | A part of the enzyme that gets destroyed at low temperatures. |
| 4. | A non-functional region involved in structural stability. |
Subtopic: Enzymes |
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The specificity of an enzyme towards its substrate is best explained by:
| 1. | Random collision between enzyme and substrate |
| 2. | Permanent covalent bonding between enzyme and substrate |
| 3. | Identical chemical composition of all substrates |
| 4. | Complementary shape between enzyme active site and substrate |
Subtopic: Enzymes | Enzymes Classification | Enzyme Catalysis |
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Enzymes show specificity because
| 1. | they act only at pH 14 |
| 2. | they convert all molecules equally |
| 3. | active site recognises substrate precisely |
| 4. | they alter equilibrium of the reaction |
Subtopic: Enzymes |
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What is the major difference between enzyme-catalysed and uncatalyzed reactions?
| 1. | Enzymes increase the activation energy required for the reaction. |
| 2. | Enzymes increase the rate of reaction without being consumed. |
| 3. | Enzymes work only in the presence of inorganic catalysts. |
| 4. | Enzymes make a reaction endothermic instead of exothermic. |
Subtopic: Enzymes | Enzyme Catalysis |
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A high fever is dangerous to a human because enzymes are ______________ by heat; without their ____________, enzymes can no longer function
1. denatured, specific structure
2. destabilized, tertiary structure
3. unfolded, catalytic ability
4. inactivated, active sites
1. denatured, specific structure
2. destabilized, tertiary structure
3. unfolded, catalytic ability
4. inactivated, active sites
Subtopic: Enzymes | Factors Affecting Enzyme Catalysis Reaction |
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The statement "All biological catalysts are proteins" is no longer valid after the discovery of:
1. ribonuclease
2. ribozyme
3. RNAs
4. DNAs
Subtopic: Enzymes |
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In the absence of an enzyme, the catalysed reaction:
| 1. | does not take place |
| 2. | takes place at a very slow rate |
| 3. | takes place at a higher rate |
| 4. | is not affected at all |
Subtopic: Enzymes | Enzyme Catalysis |
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