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. |
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1. | Nucleosome | 2. | Solenoid |
3. | Filament | 4. | Metaphase chromosome |
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Assertion (A): | Euchromatin is said to transcriptionally active protein. |
Reason (R): | Heterochromatin is said to be transcriptionally inactive. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | (A) is true but (R) is false. |
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): | S-strain of Streptococcus pneumoniae is virulent. |
Reason (R): | Heat-killed S-strain Streptococcus pneumoniae injected into mice did not cause pneumonia and did not kill them. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | (A) is true but (R) is false. |
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): | 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. |
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. |
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