Q. No.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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DNA was first identified by:
| 1. | Friedrich Meischer | 2. | Phoebus Levene |
| 3. | Linus Pauling | 4. | Erwin Chargaff |
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The discontinuously synthesized DNA fragments are later joined by:
| 1. | DNA helicase | 2. | Topoisomerase |
| 3. | DNA ligase | 4. | DNA polymerase |
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Which of the following RNAs plays both structural and catalytic roles?
| 1. | mRNA | 2. | tRNA |
| 3. | rRNA | 4. | miRNA |
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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 |
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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 |
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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 |
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Sickle cell anemia is caused by:
| 1. | Chromosomal aberration | 2. | Point mutation |
| 3. | Non-disjunction event | 4. | An arthropod vector |
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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 |
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