Select Chapter Topics:
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 |
91%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
94%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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
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 |
75%
Please attempt this question first.
Hints
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
Please attempt this question first.
Hints
Please attempt this question first.
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
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 |
81%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
94%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
80%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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
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 |
79%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
76%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Select Chapter Topics:
© 2024 GoodEd Technologies Pvt. Ltd.