- 1(current)
Q. No.A crevice or pocket into which the substrate fits forms the:
| 1. | tertiary structure of an enzyme. |
| 2. | active site of an enzyme. |
| 3. | tertiary structure of an enzyme. |
| 4. | allosteric site on an enzyme. |
Subtopic: Mechanism of Enzymes | Enzyme Introduction |
89%
Level 1: 80%+
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An enzyme catalysed biochemical reaction in a living organism is being carried out at a certain rate at 20°C. If the temperature is raised to 30°C, it is generally expected that the rate:
| 1. | will double |
| 2. | will decrease by half |
| 3. | will remain the same |
| 4. | will become zero and the reaction will stop |
Subtopic: Mechanism of Enzymes | Enzyme Introduction |
78%
Level 2: 60%+
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Rate of a physical or chemical process:
I: refers to the amount of product formed per unit time.
II: can also be called velocity if the direction is specified.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I: refers to the amount of product formed per unit time.
II: can also be called velocity if the direction is specified.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Properties of Enzymes | Mechanism of Enzymes | Enzyme Introduction |
92%
Level 1: 80%+
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For an enzyme catalysed metabolic reaction:
| I: | the formation of an ‘ES’ complex is not obligatory. |
| II; | ES’ complex formation is a transient phenomenon. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Enzyme Cofactors | Properties of Enzymes | Mechanism of Enzymes | Enzyme Introduction |
80%
Level 1: 80%+
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Which mechanism best describes the action of enzymes?
| 1. | Enzymes work by increasing the temperature of substrates. |
| 2. | Enzymes reduce the activation energy needed for a reaction. |
| 3. | Enzymes provide ATP to reactions. |
| 4. | Enzymes permanently change shape after a reaction. |
Subtopic: Enzyme Catalysis | Mechanism of Enzymes |
92%
Level 1: 80%+
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Identify the incorrect statement regarding enzyme action:
| 1. | Formation of [Enzyme Substrate] complex is obligatory |
| 2. | Enzymes speed up a chemical reaction by lowering the requirement of activation energy |
| 3. | Substrate need not go through a transition state if the enzyme catalyzed reaction is endothermic |
| 4. | Enzymes are themselves not used up in the chemical reaction catalyzed by them |
Subtopic: Mechanism of Enzymes |
85%
Level 1: 80%+
Hints
Identify the incorrect statement regarding enzymes:
| 1. | Enzymes generally function in a narrow range of temperature and pH. |
| 2. | Each enzyme shows its highest activity at a particular temperature and a pH called the optimum temperature and the optimum pH. |
| 3. | Activity declines both below and above the optimum value. |
| 4. | Low temperatures denature the enzyme; high temperatures temporarily inactivate the enzyme. |
Subtopic: Properties of Enzymes | Mechanism of Enzymes | Enzyme Introduction |
93%
Level 1: 80%+
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- 1(current)
Q. No.
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