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Q. No.What radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?
1. 35S
2. 15N
3. 32P
4. None
Subtopic: DNA Replication |
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Whose cell free system finally helped the genetic code to be deciphered?
| 1. | Gamow | 2. | Severo Ochoa |
| 3. | Hargobind Khorana | 4. | Marshall Nirenberg |
Subtopic: Genetic Code |
67%
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Which of the following would be nucleoside found only in RNA?
| 1. | Thymidine | 2. | Cytidine |
| 3. | Uridine | 4. | Adenosine |
Subtopic: DNA vs RNA as Genetic Material |
94%
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Subtopic: Genetic Code: I | Genetic Code: II | Genetic Code: III |
91%
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A segment of DNA coding for a polypeptide is most accurately defined as:
| 1. | Operon | 2. | Gene |
| 3. | Recon | 4. | Cistron |
Subtopic: Transcription |
75%
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The central dogma of molecular biology was proposed by:
| 1. | Francis Crick | 2. | James Watson |
| 3. | Rosalind Franklin | 4. | Erwin Chargaff |
Subtopic: DNA Double Helix |
91%
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The unequivocal proof that DNA is the genetic material was provided by:
| 1. | Avery, Macleod, and McCarty |
| 2. | Hershey and Chase |
| 3. | Meselson and Stahl |
| 4. | Watson and Crick |
Subtopic: Search for Genetic Material |
87%
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Hershey and Chase proved DNA as the genetic material in their experiment because :
| 1. | Bacteria that were infected with viruses that had radioactive proteins were not radioactive. |
| 2. | Bacteria that were infected with viruses that had radioactive DNA were radioactive. |
| 3. | Both 1 and 2 are correct. |
| 4. | Both 1 and 2 are incorrect. |
Subtopic: Search for Genetic Material |
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DNA replication is correctly described as:
| 1. | Semi-conservative and Continuous |
| 2. | Semi-conservative and Discontinuous |
| 3. | Conservative and Continuous |
| 4. | Semi-conservative and Semi-discontinuous |
Subtopic: DNA Replication |
57%
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According to Erwin Chargaff, in a double-stranded DNA
| 1. | The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant and equal. |
| 2. | The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant but are not equal to one. |
| 3. | The ratios between Adenine and Guanine, and, Thymine and Cytosine are constant and equal. |
| 4. | The ratios between Adenine and Guanine, and, Thymine and Cytosine are constant but are not equal to one. |
Subtopic: DNA Double Helix |
74%
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