- 1(current)
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 |
92%
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 |
89%
Level 1: 80%+
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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 |
88%
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 |
85%
Level 1: 80%+
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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. |
Subtopic: Enzymes | Enzyme Catalysis |
82%
Level 1: 80%+
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