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 |
 83%
From NCERT
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 |
 51%
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 |
 69%
From NCERT
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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 |
 78%
From NCERT
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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 |
 68%
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 |
 78%
From NCERT
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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 |
 55%
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Alkaloid | P | Ricin |
| B | Toxin | Q | Vinblastin |
| C | Lectin | R | Morphine |
| D | Drug | S | Concanavalin A |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | S | R | Q | P |
| 3. | R | P | S | Q |
| 4. | R | P | Q | S |
Subtopic: Â Primary & Secondary Metabolites |
 88%
From NCERT
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The biomolecule shown in the given figure is:
| 1. | an aromatic amino acid |
| 2. | a zwitterion |
| 3. | a substituted pyrimidine |
| 4. | a substituted purine |
Subtopic: Â The DNA |Â Introduction |
 79%
From NCERT
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