Q. No.The figure shows the Meselson and Stahl experiment. Identify the correct statements:
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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| Assertion (A): | Both the strands of DNA are not copied during transcription. |
| Reason (R): | Both strands of DNA are identical in their base composition. |
| 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): | In transcription, the strand that does not code for anything is referred to as the coding strand. |
| Reason (R): | It is the presence of the promoter in a transcription unit that defines the template and coding strands. |
| 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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| Assertion (A): | Transcription and translation can be coupled in bacteria. |
| Reason (R): | In bacteria, the mRNA does not require any processing to become active, and also transcription and translation take place in the same compartment. |
| 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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