Q. No.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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The non protein constituent present in many enzymes is called:
| 1. Co-enzyme | 2. Co-factor |
| 3. Apoenzyme | 4. Holoenzyme |
Subtopic: Enzyme Cofactors |
73%
Level 2: 60%+
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Haem in hemoglobin:
| 1. | is loosely bound |
| 2. | is the co-enzyme |
| 3. | is the prosthetic group |
| 4. | has no influence on activity of Hb |
Subtopic: Enzyme Cofactors |
84%
Level 1: 80%+
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What is the co-factor for the proteolytic enzyme, carboxypeptidase?
| 1. | Molybdenum | 2. | Manganese |
| 3. | Zinc | 4. | Copper |
Subtopic: Enzyme Cofactors |
88%
Level 1: 80%+
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Subtopic: Enzyme Cofactors |
66%
Level 2: 60%+
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Consider the following two statements regarding enzyme action:
| I: | Co-factors play a crucial role in the catalytic activity of the enzyme. |
| II: | Catalytic activity is reduced when the co-factor is removed from the enzyme. |
Of the above statements:
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: Enzyme Cofactors |
Level 3: 35%-60%
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Consider the following enzymes:
I. Catalase
II. Peroxidase
III. Carboxypeptidase
Which of these enzymes require haem as a co-factor for their activity?
| 1. | I only | 2. | I and II only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: Enzyme Cofactors |
68%
Level 2: 60%+
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Co-enzymes:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | are organic compounds associated permanently with the apoenzyme. |
| II: | serve as co-factors in a number of different enzyme catalyzed reactions. |
| III: | have, many of them, vitamins as their essential chemical components. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Enzyme Cofactors |
71%
Level 2: 60%+
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Prosthetic groups are distinguished from other cofactors in that they:
1. Only I is true
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | are organic compounds. |
| II: | are tightly bound to the apoenzyme. |
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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Coenzymes nicotinamide adenine dinucleotide (NAD) and NADP contain the vitamin:
| 1. | Riboflavin | 2. | Pantothenic acid |
| 3. | Niacin | 4. | Pteroylglutamic acid |
Subtopic: Enzyme Cofactors |
92%
Level 1: 80%+
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