B-DNA is the most common form of DNA having all the following salient features except
1.
The pitch would be 34 Å
2.
The strand turns 36° at each step of ascent
3.
The rise per base pair is 3.6 Å
4.
One full turn of helical strand involves 10 base pairs
Subtopic: Nucleic Acid | The DNA |
68%
Level 2: 60%+
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Match column I with column II and select the correct option.
1. a(ii), b(iii), c(iv), d(i)
2. a(ii), b(iv), c(iii), d(i)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(i), c(iii), d(ii)
| Column I | Column II | ||
| a. | Phosphate and hydroxyl group of sugar in a nucleotide | (i) | Peptide bond |
| b. | Polymer of amino acids | (ii) | Glycosidic bond |
| c. | Polysaccharides | (iii) | Hydrogen bond |
| d. | Adenine and thymine in a DNA | (iv) | Ester bond |
2. a(ii), b(iv), c(iii), d(i)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(i), c(iii), d(ii)
Subtopic: The DNA | Amino Acids | Zwitter ion & Peptide Bond | Carbohydrates: Glycosidic Bond & Disaccharide |
87%
Level 1: 80%+
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
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: Enzymes | Enzyme Catalysis |
Level 3: 35%-60%
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NEET 2026 - Target Batch - Vital
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Subtopic: Nucleic Acid: Nucleotides |
62%
Level 2: 60%+
NEET - 2013
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
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: Enzymes |
85%
Level 1: 80%+
NEET - 2013
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
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: Different Amino Acids |
81%
Level 1: 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: Introduction |
72%
Level 2: 60%+
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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: Introduction |
79%
Level 2: 60%+
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Match each item in Column I with one in Column II and select the correct match from the codes given:
| 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: Primary & Secondary Metabolites |
89%
Level 1: 80%+
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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: The DNA | Introduction |
81%
Level 1: 80%+
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