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Q. No.Identify the incorrect statement regarding enzyme action:
1.
Formation of [Enzyme Substrate] complex is obligatory
2.
Enzymes speed up a chemical reaction by lowering the requirement of activation energy
3.
Substrate need not go through a transition state if the enzyme catalyzed reaction is endothermic
4.
Enzymes are themselves not used up in the chemical reaction catalyzed by them
Subtopic: Mechanism of Enzymes |
83%
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Which of the following is not an example of a secondary metabolite produced in living organisms?
| 1. | Lecithin | 2. | Alkaloids |
| 3. | Flavonoids | 4. | Antibiotics |
Subtopic: Lipids: Fatty Acids | Primary & Secondary Metabolites |
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In a typical cell, which of the following constitutes least % of the total cellular mass?
| 1. | Proteins | 2. | Nucleic acids |
| 3. | Carbohydrates | 4. | Lipids |
Subtopic: Primary & Secondary Metabolites |
70%
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Which of the following organic compounds is the main constituent of Lecithin?
| 1. | Arachidonic acid | 2. | Phospholipid |
| 3. | Cholesterol | 4. | Phosphoprotein |
Subtopic: Lipids |
91%
From NCERT
NEET - 2019
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Consider the given two statements:
| I: | In competitive enzyme inhibition, the substrate and inhibitor cannot bind to the enzyme at the same time. |
| II: | The inhibitor always has a much higher affinity for the active site than the normal substrate. |
| 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 Inhibition |
From NCERT
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Consider the following two statements:
| I: | Enzyme catalyzed reactions are affected by the change in the temperature and pH. |
| II: | Change in pH and temperature affects the tertiary structure of proteins. |
| 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: Factors Affecting Enzyme Catalysis Reaction |
74%
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Consider the given two statements:
| I: | Lipids come under acid insoluble fraction. |
| II: | Lipids are macromolecules. |
| 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: Element Analysis |
59%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | Dietary proteins are the source of essential amino acids. |
| Reason (R): | All essential amino acids are aromatic. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Proteins |
85%
From NCERT
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Regarding polysaccharides:
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: | Cellulose does not contain complex helices. |
| II: | Inulin is a polymer of fructose. |
| III: | Left end of glycogen is the reducing end |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Carbohydrates | Carbohydrates: Starch & Glycogen | Carbohydrates: Cellulose, Chitin, Inulin & Agar |
71%
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Identify the incorrect statement:
| 1. | Zinc is a cofactor for carboxypeptidase |
| 2. | NADP contains the vitamin cyanocobalamin |
| 3. | Malonate is a competitive inhibitor of Succinic dehydrogenase |
| 4. | Haem is the prosthetic group in peroxidase |
Subtopic: Enzyme Cofactors |
82%
From NCERT
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