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Q. No.Which of the following is correct?
1. Enzyme has a active site so that a highly reactive enzyme-substrate complex is produced.
2. ES complex is short lived.
3. The formation of ES complex is essential for catalysis.
4. All of these
Subtopic: Enzyme Catalysis |
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Level 1: 80%+
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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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Level 1: 80%+
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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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Km value of an enzyme signifies the substrate concentration at which the enzyme catalyzed reaction:
1. achieves Vmax
2. achieves ½ Vmax
3. is not affected by the presence of a competitive inhibitor
4. stops
1. achieves Vmax
2. achieves ½ Vmax
3. is not affected by the presence of a competitive inhibitor
4. stops
Subtopic: Enzyme Catalysis |
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Level 1: 80%+
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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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The substrate concentration in a reaction which is governed by an enzyme is slowly increased to high levels. As the substrate concentration increases the reaction rate:
1. continues to increase indefinitely.
2. continues to decrease indefinitely.
3. increases at first, then levels off.
4. does not change.
1. continues to increase indefinitely.
2. continues to decrease indefinitely.
3. increases at first, then levels off.
4. does not change.
Subtopic: Enzymes | Enzyme Catalysis |
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