Read the statements A and B carefully and select the correct answer.
Statement A: Enzyme-substrate complex produced during a catalysed reaction is highly reactive.
Statement B: This complex dissociates into its product and changed enzyme with an intermediate formation of enzyme-product
complex.
1. Both statements A and B are correct
2. Both statements A and B are incorrect
3. Only statement A is correct
4. Only statement A is incorrect
Subtopic: Â Enzymes |Â Enzyme Catalysis |
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Subtopic: Â Nucleic Acid: Nucleotides |
 62%
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NEET - 2013
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Which of the following statements about enzymes is wrong?
| 1. | Enzymes are denatured at high temperatures |
| 2. | Enzymes are mostly proteins but some are lipids also |
| 3. | Enzymes are highly specific. |
| 4. | Enzymes require optimum pH and temperature for maximum activity. |
Subtopic: Â Enzymes |
 85%
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NEET - 2013
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The manner in which the individual folded polypeptides or subunits are arranged with respect to each other is the architecture of a protein otherwise called the:
1. primary structure of a protein
2. secondary structure of a protein
3. tertiary structure of a protein
4. quaternary structure of a protein
1. primary structure of a protein
2. secondary structure of a protein
3. tertiary structure of a protein
4. quaternary structure of a protein
Subtopic: Â Proteins |
 52%
From NCERT
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In inhibition of succinic dehydrogenase by malonate:
I. Malonate closely resembles the substrate succinate in structure.
II. The binding of malonate to succinic dehydrogenase reduces its activity but does not affect the binding of succinate.
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. Malonate closely resembles the substrate succinate in structure.
II. The binding of malonate to succinic dehydrogenase reduces its activity but does not affect the binding of succinate.
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: Â Enzyme Inhibition |
 70%
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Assertion(A): Amino acids can be essential or non-essential.
Reason(R): Dietary proteins are the source of non-essential proteins.
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. (A) is false, but (R) is true.
Reason(R): Dietary proteins are the source of non-essential proteins.
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. (A) is false, but (R) is true.
Subtopic: Â Different Amino Acids |
 80%
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Assertion(A): Elemental analysis gives elemental composition of living tissues in the form of hydrogen, oxygen, chlorine, carbon etc
Reason(R): The ash generated after burning the tissue contains carbon and water.
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. (A) is false, but (R) is true.
Reason(R): The ash generated after burning the tissue contains carbon and water.
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. (A) is false, but (R) is true.
Subtopic: Â Introduction |
 71%
From NCERT
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Assertion(A): The membrane fragments get separated along with the acid-insoluble pool.
Reason(R): Cell membrane and other membranes form vesicles which are not water-soluble.
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. (A) is false, but (R) is true.
Reason(R): Cell membrane and other membranes form vesicles which are not water-soluble.
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. (A) is false, but (R) is true.
Subtopic: Â Introduction |
 79%
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Assertion (A): Water accounts for about 80 to 90% of a plant cell's expansion.
Reason (R): Enzymes are active in hydrated medium only.
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.
Reason (R): Enzymes are active in hydrated medium only.
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: Â Introduction |
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Assertion (A): Deoxyribose, \(C_5H_{10}O_4\) is not exactly hydrate of carbon.
Reason (R): Carbohydrates are hydrates of carbon so compounds which follow \(\text C_\text x(\text H_2\text O)_\text Y\) formula are carbohydrates
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.
Reason (R): Carbohydrates are hydrates of carbon so compounds which follow \(\text C_\text x(\text H_2\text O)_\text Y\) formula are carbohydrates
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: Â Carbohydrates |
 58%
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