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Q. No.Consider the given two statements:
| Assertion (A): | The distance between a bp in a B-DNA helix is approximately 0.34 nm. |
| Reason (R): | The pitch of the B-DNA helix is 3.4 nm and there are roughly 10 bp in each turn. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: DNA Double Helix |
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Consider the given two statements:
| Assertion (A): | Retroviruses are one known exception to the central dogma in molecular biology as proposed by Francis Crick. |
| Reason (R): | In retroviruses a sequence of nucleotides is copied from an RNA template during the synthesis of a molecule of DNA. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: The DNA |
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Consider the given two statements:
| Assertion (A): | Viruses grown in the presence of radioactive phosphorus contained radioactive proteins but not radioactive DNA. |
| Reason (R): | DNA contains phosphorus but protein does not. |
| 1. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
Subtopic: Search for Genetic Material |
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Consider the given two statements:
| Assertion (A): | RNA can directly code for the synthesis of proteins and can easily express the characters. |
| Reason (R): | DNA is dependent on RNA for synthesis of proteins. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A) . |
Subtopic: Search for Genetic Material: II |
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Consider the given two statements:
Choose the correct option.
| Assertion (A): | Griffith's experiment demonstrated the presence of a transforming principle in bacteria. |
| Reason (R): | Heat-killed virulent bacteria could transform non-virulent bacteria into virulent forms. |
| 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. | (A) is False but (R) is True. |
Subtopic: Search for Genetic Material |
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Consider the given two statements:
| I: | Among the two nucleic acids DNA is a better genetic material. |
| II: | The protein synthesizing machinery has evolved around RNA and not DNA. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | Both I and II are incorrect |
Subtopic: DNA vs RNA as Genetic Material |
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Identify the incorrect match between the scientists in Column I with their contributions in Column II:
|
|
COLUMN I |
COLUMN II |
|
1. |
Frederick Griffith |
Discovery of bacterial transformation |
|
2. |
Meselson and Stahl |
Proposed semi-conservative mode of DNA replication based on complementary base pairing and antiparallel strands |
|
3. |
Avery, Macleod, and McCarty |
Purified the transforming principle and found it to be DNA |
|
4. |
Erwin Chargaff |
In natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units |
Subtopic: DNA vs RNA as Genetic Material |
54%
From NCERT
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Consider the given two statements:
| Assertion (A): | Both the nucleic acids (DNA and RNA) have the ability to direct their duplications |
| Reason (R): | Both the nucleic acids (DNA and RNA) are double stranded molecules. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: DNA vs RNA as Genetic Material |
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From NCERT
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Consider the given two statements:
| Assertion (A): | Of the two nucleic acids, DNA and RNA, only DNA can act as genetic material |
| Reason (R): | Only DNA and not RNA has the capability to generate its replica. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is False |
Subtopic: DNA vs RNA as Genetic Material |
72%
From NCERT
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Consider the given two statements:
| Assertion (A): | DNA is a better genetic material than RNA. |
| Reason (R): | DNA is more stable than RNA because of its double-stranded structure and lacks the hydroxyl group at the 2' position |
| 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. | (A) is False but (R) is True. |
Subtopic: DNA vs RNA as Genetic Material |
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