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Q. No.DNA was first identified by:
1. Friedrich Meischer 2. Phoebus Levene 3. Linus Pauling 4. Erwin Chargaff
Subtopic: DNA Double Helix |
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The discontinuously synthesized DNA fragments are later joined by:
| 1. | DNA helicase | 2. | Topoisomerase |
| 3. | DNA ligase | 4. | DNA polymerase |
Subtopic: DNA Replication |
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Which of the following RNAs plays both structural and catalytic roles?
| 1. | mRNA | 2. | tRNA |
| 3. | rRNA | 4. | miRNA |
Subtopic: Transcription: I |
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If E.coli was allowed to grow for 80 minutes after transfer from 15N to 14N medium, the number of hybrid density DNA molecules would be:
| 1. | 2 | 2. | 16 |
| 3. | 14 | 4. | 8 |
Subtopic: DNA Replication |
63%
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In eukaryotes, the sequences that appear in mature or processed mRNA are called:
| 1. | Introns | 2. | Cistrons |
| 3. | Exons | 4. | Mutons |
Subtopic: Transcription: I |
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What radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?
1. 35S
2. 15N
3. 32P
4. None
1. 35S
2. 15N
3. 32P
4. None
Subtopic: DNA Replication |
From NCERT
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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 |
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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 |
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Subtopic: Genetic Code: I | Genetic Code: II | Genetic Code: III |
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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 |
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