Semiconservative Replication

Q. E. coli about to replicate was placed in a medium containing radioactive thymidine for 5 minutes. Then it was made to replicate in a normal medium. Which of the following observations will be correct?

1. Both the strands of DNA will be radioactive
2. One strand radioactive
3. Each half strand radioactive
4. None is radioactive

Q.

Regarding the assertion and reason, select the correct option.

Assertion [A]: DNA replication is semiconservative in nature.

Reason [R]: One of the DNA strands is synthesised continuously, while the other is synthesised discontinuously.

1. Both A and R are true and R explains A

2. Both A and B are true, but R does not explain A

3. A is true and R is false

4. Both A and R are false

Q. Taylor conducted the experiments to prove semiconservative mode of chromosome replication on

1. E. coli
2. Vinca rosea
3. Vicia faba
4. Drosophila melanogaster

Q. The semiconservative nature of replication of DNA is observed in all organisms.

1. False
2. True