- 1(current)
Q. No.The number of correct statement(s) from the given statements is/are:
1. 2
2. 3
3. 4
4. 5
| I: | Almost all enzymes are proteins. |
| II: | Some nucleic acids can behave like enzymes. |
| III: | No enzyme in living organisms can function above 40 °C. |
| IV: | Enzymes are the reason that chemicals react with each other. |
| V: | Enzymes are not sensitive to pH in their environment. |
2. 3
3. 4
4. 5
Subtopic: Enzymes | Enzyme Catalysis | Factors Affecting Enzyme Catalysis Reaction |
From NCERT
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Consider the two statements:
| Assertion (A): | Enzyme-catalyzed reactions proceed at rates vastly higher than that of uncatalyzed ones. |
| Reason: | Enzymes require an optimum temperature and an optimum pH to work efficiently. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
Subtopic: Enzymes | Enzyme Catalysis | Factors Affecting Enzyme Catalysis Reaction |
87%
From NCERT
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The graph shown below shows the effect of a certain factor on the rate of a reaction catalyzed by an enzyme. The X-axis would show the said factor and that will be:
| 1. substrate concentration | 2. pH |
| 3. enzyme concentration | 4. temperature |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
57%
From NCERT
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Hints
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Consider the given two statements:
| Assertion (A): | High temperature destroys enzymatic activity. |
| Reason (R): | Enzymes generally function in a narrow range of temperatures. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but the (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
From NCERT
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Which statement correctly describes the impact of temperature on enzyme activity?
| 1. | Enzyme activity decreases indefinitely as temperature increases due to increased kinetic energy of the substrates. |
| 2. | Enzyme activity increases until an optimum temperature is reached, beyond which activity declines rapidly due to denaturation. |
| 3. | Enzyme activity is independent of temperature changes within the living organism’s permissible range. |
| 4. | High temperatures always increase enzyme stability and, therefore, enhance enzyme activity. |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
94%
From NCERT
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Consider the following two statements:
| I: | Enzyme catalyzed reactions are affected by the change in the temperature and pH. |
| II: | Change in pH and temperature affects the tertiary structure of proteins. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
74%
From NCERT
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Low temperature:
1. Preserves enzyme in a temporary inactive state
2. Denatures the enzyme
3. Makes enzyme more active
4. Does not have any affect on enzyme activity
Subtopic: Enzyme Catalysis | Factors Affecting Enzyme Catalysis Reaction |
86%
From NCERT
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Hints
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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 and the reaction ultimately reaches a maximum velocity (Vmax) which is not exceeded by any further rise in concentration of the substrate. |
| Reason (R) | The enzyme molecules are fewer than the substrate molecules. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
77%
From NCERT
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Which of the following describes the substrate concentration at which an enzyme-catalyzed reaction achieves half Vmax?
1. Km value
2. Kcat value
3. pKa value
4. Q10
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
94%
From NCERT
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