What radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?
1. | 35S | 2. | 15N |
3. | 32P | 4. | None |
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 |
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 |
The discontinuously synthesized DNA fragments are later joined by:
1. | DNA helicase | 2. | Topoisomerase |
3. | DNA ligase | 4. | DNA polymerase |
Which of the following is true for both transcription and DNA replication?
1. | The principle of complementarity governs the processes |
2. | Only if the two strands act as a template |
3. | Only a segment of both strands is involved |
4. | Adenine base pairs with thymine |
During DNA replication, Okazaki fragments are used to elongate:
1. | The lagging strand towards the replication fork. |
2. | The leading strand away from the replication fork. |
3. | The lagging strand away from the replication fork. |
4. | The leading strand towards the replication fork. |