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Q. No.The catalytic cycle of an enzyme action can be described in certain steps. Which of the following is not true in this regard?
| 1. | The substrate binds to the active site of the enzyme, fitting into the active site. |
| 2. | The binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate. |
| 3. | The active site of the enzyme, now in close proximity of the substrate breaks the chemical bonds of the substrate and the new enzyme- product complex is formed. |
| 4. | The enzyme releases the products of the reaction and the enzyme is used up and cannot be used again. |
Subtopic: Â Mechanism of Enzymes |Â Enzyme Introduction |
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Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first but ultimately reaches a maximum velocity which is not exceeded by any further rise in concentration of the substrate. |
| Reason (R): | The enzyme molecules are fewer than the substrate molecules and after saturation of these molecules, there are no free enzyme molecules to bind with the additional substrate molecules. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True but (R) does not explain (A) |
| 3. | (A) is False but (R) is True |
| 4. | Both (A) and (R) are True and (R) correctly explains (A) |
Subtopic: Â Properties of Enzymes |Â Mechanism of Enzymes |Â Enzyme Introduction |
 90%
Level 1: 80%+
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Q. No.
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