- 1(current)
Q. No.| 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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Which of the following would be nucleoside found only in RNA?
| 1. | Thymidine | 2. | Cytidine |
| 3. | Uridine | 4. | Adenosine |
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DNA is structurally and chemically more stable than RNA because of the following except:
| 1. | It has thymine instead of uracil |
| 2. | 2’ –OH is absent in DNA |
| 3. | It replicates itself based on complementary base pairing |
| 4. | It does not have any catalytic role |
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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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Consider the following statements:
| I: | RNA is the genetic material of the QB bacteriophage. |
| II: | DNA chemically is less reactive and more stable than RNA. |
| III: | Viruses having RNA genomes and shorter life spans mutate & evolve slowly. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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The protein synthesizing machinery of a cell has evolved around:
| 1. | DNA | 2. | RNA |
| 3. | Protein itself | 4. | Viroids |
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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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Who proposed a semi-conservative mode of replication for DNA?
| 1. | Watson and Crick | 2. | Meselson and Stahl |
| 3. | Hershey and Chase | 4. | Beadle and Tatum |
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Q. No.
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