Q. No.The diagram shows the DNA double helix. What will be true for the helix?
I.
A represents a base pair where the plane of one base pair stacks over the other in the double helix giving the helix more stability in addition to hydrogen bonds.
II.
There are 10 base pairs in one complete turn of B-dNA.
III.
B is the backbone constituted by sugar-phosphate.
IV.
The two strands are parallel-oriented in the same direction with respect to each other.
V:
The diameter is uniform, around 2.0nm.
1.
Only I, II, and III
2.
Only II, III, IV, and V
3.
Only I, II, III, and V
4.
I, II, III, IV and V
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| Assertion (A): | The distance between the two strands of the DNA helix is approximately uniform. |
| Reason (R): | Base pairing is complementary, where a purine always base pairs with a pyrimidine and a pyrimidine always base pairs with a purine. |
| 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. |
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| I: | If the sequence of bases in one strand of a double-stranded DNA is known, then the sequence in other strands can be predicted. |
| II: | If each strand from a DNA acts as a template for the synthesis of a new strand, the two double-stranded DNA thus, produced would be identical to the parental DNA molecule. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
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| Statement I: | A is ‘replication’ where DNA is replicated in a semi-conservative manner. |
| Statement II: | B is ‘transcription’ and is so called because the language of RNA is only a slight variant of the language of the DNA. |
| Statement III: | C is ‘translation’ and is so called because the language of Protein is entirely different from the language of RNA. |
| 1. | Statement I is correct, Statement II is incorrect, Statement III is incorrect |
| 2. | Statement I is correct, Statement II is correct, Statement III is incorrect |
| 3. | Statement I is correct, Statement II is correct, Statement III is correct |
| 4. | Statement I is incorrect, Statement II is incorrect, Statement III is incorrect |
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| Assertion (A): | A set of positively charged and basic proteins are used in the packaging of Eukaryotic DNA. |
| Reason (R): | DNA molecule is acid and carries a negative charge. |
| 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. |
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| I: | A is H1 histone. |
| II: | B is a tetramer made of histone proteins. |
1. Statement I is correct, Statement II is incorrect.
2. Statement I is incorrect, Statement II is correct.
3. Statement I is incorrect, Statement II is incorrect.
4. Statement I is correct, Statement II is correct.
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| 1. | Nucleosome | 2. | Solenoid |
| 3. | Filament | 4. | Metaphase chromosome |
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| Assertion (A): | Euchromatin is said to transcriptionally active protein. |
| Reason (R): | Heterochromatin is said to be transcriptionally inactive. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | (A) is true but (R) is false. |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. | Both (A) and (R) are false. |
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| Assertion (A): | S-strain of Streptococcus pneumoniae is virulent. |
| Reason (R): | Heat-killed S-strain Streptococcus pneumoniae injected into mice did not cause pneumonia and did not kill them. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | (A) is true but (R) is false. |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. | Both (A) and (R) are false. |
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| Assertion (A): | In Avery, Macleod, and McCarty's experiment, digestion of heat-killed lysate with proteases and RNases did not affect transformation but digestion with DNase did. |
| Reason (R): | DNase will hydrolyse all biomolecules in the lysate except DNA. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | Both (A) and (R) are False. |
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