Q. No.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):
RNA was the first genetic material.
Reason (R):
RNA can act as the template for the synthesis of DNA and has catalytic functions as well.
In the light of the above statements, choose the most appropriate answer from the options given below :
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are false.
3.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
4.
(A) is true but (R) is false.
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| Statement I: | There is now enough evidence to suggest that essential life processes (such as metabolism, translation, splicing, etc.), evolved around RNA. |
| Statement II: | DNA being double-stranded and having complementary strands further resists changes by evolving a process of repair. |
1. Statement I is correct, Statement II is correct
2. Statement I is correct, Statement II is incorrect
3. Statement I is incorrect, Statement II is correct
4. Statement I is incorrect, Statement II is incorrect
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| 1. | Watson and Crick's model for semi-conservative DNA replication |
| 2. | Temin and Baltimore model for reverse transcription |
| 3. | Transcription of rRNA and tRNA on the template of DNA |
| 4. | Transcription of mRNA and hnRNA on the template of DNA |
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| I: | The result at the end of 20 minutes excludes the ‘conservative’ mode of DNA replication. |
| II: | The result at the end of 40 minutes excludes the ‘dispersive’ mode of DNA replication. |
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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| Assertion (A): | Deoxyribonulceoside triphosphates provide energy for polymerization reactions during the replication of DNA. |
| Reason (R): | The two terminal phosphates in a deoxyribonucleoside triphosphate are high-energy phosphates, the same as in the case of ATP. |
| 1. | (A) is true but (R) is false. |
| 2. | Both (A) and (R) are false. |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
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| Assertion (A): | For long DNA molecules, the replication occurs within a small opening of the DNA helix, referred to as the replication fork. |
| Reason (R): | The DNA polymerases on their own cannot initiate the process of replication. |
| 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. | Both (A) and (R) are False. |
| 4. | (A) is True but (R) is False. |
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| Statement I: | A is an Okazaki fragment and such fragments make up the lagging strand which is replicated away from the replication fork. |
| Statement II: | B is the leading strand that is continuously replicated towards the replication fork. |
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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| Assertion (A): | A piece of DNA if needed to be propagated during recombinant DNA procedures requires a vector. |
| Reason (R): | The vectors provide the origin of replication. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are False. |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
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| Assertion (A): | The replication of DNA and cell division cycle should be highly coordinated. |
| Reason (R): | In eukaryotes, the replication of DNA takes place at the S-phase of the cell cycle. |
| 1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 2. | Both (A) and (R) are false. |
| 3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
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| Assertion (A): | It is necessary to define the boundaries that would demarcate the region and the strand of DNA that would be transcribed. |
| Reason (R): | Reason: Both strands of DNA are not copied during transcription. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are false. |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
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