Q. No.Consider the given statements:
I:
DNA – deoxyribonucleic acid – is the genetic material, at least for the majority of organisms.
II:
RNA though it also acts as a genetic material in some viruses, mostly functions as a messenger.
III.
RNA can function as an adapter, structural, and in some cases as a catalytic molecule.
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
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| Statement I: | A is the 5’ end of the polynucleotide chain and B is the 3’ end of the polynucleotide chain. |
| Statement II: | The nitrogenous bases linked to sugar moiety project from the backbone. |
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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| Statement I: | A shows the hydrogen bonds where a triple bond links Guanine and Cytosine and a double bond links Adenine and Thymine. |
| Statement II: | If Adenine in such a dsDNA molecule is found to be 20 %, the amount of Cytosine in this ds DNA molecule is expected to be 20 %. |
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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| 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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