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Q. No.The direction of a phosphodiester bond [in a polynucleotide chain] is:
1.
5’ – 3’
2.
3’ – 5’
3.
1’ – 3’
4.
3’ – 1’
Subtopic: Nucleic Acid |
52%
From NCERT
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The famous Watson-Crick model of DNA helix describes its:
| 1. | Primary structure | 2. | Secondary structure |
| 3. | Tertiary structure | 4. | Quaternary structure |
Subtopic: The DNA |
69%
From NCERT
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Almost all enzymes are proteins but a few may be:
| 1. | nucleic acids | 2. | carbohydrates |
| 3. | lipids | 4. | metal ions |
Subtopic: Enzymes |
80%
From NCERT
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In the absence of an enzyme, the reaction catalysed by this enzyme:
1. will not take place
2. is very slow
3. produces some other product
4. gets faster
1. will not take place
2. is very slow
3. produces some other product
4. gets faster
Subtopic: Enzyme Catalysis |
81%
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 |
86%
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 |
87%
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 |
86%
From NCERT
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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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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 |
79%
From NCERT
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Inhibition of succinic dehydrogenase by malonate is an example of:
1. Competitive inhibition
2. Non-competitive inhibition
3. Un-competitive inhibition
4. Allosteric feedback inhibition
1. Competitive inhibition
2. Non-competitive inhibition
3. Un-competitive inhibition
4. Allosteric feedback inhibition
Subtopic: Enzyme Inhibition |
91%
From NCERT
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