Q. No.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
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.
In the light of the above statements, choose the most appropriate answer from the options given below :
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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| Assertion (A): | Even after the results of Avery, Macleod, and McCarty's experiment, not all biologists were convinced that DNA is hereditary material. |
| Reason (R): | Proteins were conclusively proved to be the genetic material for almost all living organisms. |
| 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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| I. | ‘A’ shows that viruses grown on radioactive sulfur contained radioactive protein but not radioactive DNA because DNA does not contain sulfur. |
| II. | ‘B’ shows that viruses are grown in the presence of radioactive phosphorus contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not. |
| III. | The result ‘X’ shows bacteria that were infected with viruses that had radioactive DNA were radioactive, indicating that DNA was the material. |
| IV. | The result ‘Y’ shows bacteria that were infected with viruses that had radioactive proteins were not radioactive indicating that proteins did not enter the bacteria from the viruses. |
1. Only Statement I and Statement II.
2. Only Statement I and Statement III.
3. Only Statement I and Statement IV.
4. Only Statement III and Statement IV.
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| Assertion (A): | A molecule that can act as a genetic material should be able to express itself in the form of ‘Mendelian Characters’. |
| Reason (R): | A molecule that can act as a genetic material should provide the scope for slow changes. |
| 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): | 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. |
| 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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