- 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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In general, with every 10oC rise in the temperature [in the range 0oC to 40oC], the rate of enzyme catalyzed reaction:
1. Becomes half
2. Gets doubled
3. Remains same
4. There is no such correlation in general
Subtopic: Enzyme Catalysis |
84%
From NCERT
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In an enzyme catalysed biochemical reaction, the formation of enzyme-substrate complex is:
1. optional and transient
2. obligatory and transient
3. obligatory and permanent
4. needed only in anabolic reactions
1. optional and transient
2. obligatory and transient
3. obligatory and permanent
4. needed only in anabolic reactions
Subtopic: Enzyme Catalysis |
84%
From NCERT
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Consider the two statements:
| Statement I: | Whether it is an exothermic or spontaneous reaction or an endothermic or energy requiring reaction, the ‘S’ has to go through a much higher energy state or transition state. |
| Statement II: | Enzymes eventually bring down this energy barrier of activation energy making the transition of ‘S’ to ‘P’ more easy. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Enzyme Catalysis |
86%
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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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%
From NCERT
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Which of the following will not be correct for the steps of the catalytic cycle of an enzyme action?
| 1. | First, 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 gets consumed in the reaction while releasing the product. |
Subtopic: Enzyme Catalysis |
84%
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
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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NEET 2025 - Target Batch
- 1(current)
Q. No.
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