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Q. No.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 |
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Level 2: 60%+
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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 |
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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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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 |
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Level 1: 80%+
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Consider the given statements regarding competitive enzyme inhibition:
| Statement I: | Competitive inhibitor closely resembles the substrate in its molecular structure |
| Statement II: | In spite of its close structural similarity with the substrate, the inhibitor does not compete with the substrate for the substrate-binding site of the enzyme. |
| Statement III: | Inhibition of succinic dehydrogenase by succinate which closely resembles the substrate malonate in structure is an example of competitive inhibition. |
| 1. | Statement I is correct; Statement II is correct; Statement III is correct |
| 2. | Statement I is incorrect; Statement II is correct; Statement III is incorrect |
| 3. | Statement I is correct; Statement II is incorrect; Statement III is incorrect |
| 4. | Statement I is correct; Statement II is correct; Statement III is incorrect |
Subtopic: Enzyme Inhibition: Introduction | Enzyme Inhibition |
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Level 2: 60%+
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Co-enzymes:
| a. | are inorganic compounds |
| b. | are permanently associated with the apoenzyme |
| c. | are organic compounds |
| d. | are transiently associated with the apoenzyme. |
| 1. | a and b are correct |
| 2. | a and d are correct |
| 3. | b and c are correct |
| 4. | c and d are correct |
Subtopic: Enzyme Cofactors |
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Metal ions required by some enzymes as co-factors:
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: | form covalent bonds with side chains at the active site of the enzyme |
| II: | form one or more covalent bonds with the substrate. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Enzyme Cofactors |
Level 3: 35%-60%
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The molecule shown in the given figure:
1. is a substituted purine found in DNA
2. is a substituted purine found in RNA
3. is a substituted pyrimidine found in DNA
4. is a substituted pyrimidine found in RNA
1. is a substituted purine found in DNA
2. is a substituted purine found in RNA
3. is a substituted pyrimidine found in DNA
4. is a substituted pyrimidine found in RNA
Subtopic: Element Analysis |
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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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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 |
87%
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