During the replication of a bacterial chromosome,$DNA$ synthesis starts at the origin of replication and proceeds in:

On which template strand of $DNA$ is the new strand synthesized discontinuously?

Which of the following statements is correct regarding the process of replication in $E. coli$?

The experimental proof for semiconservative replication of $DNA$ was first shown in a:

Which of the following did Meselson and Stahl use in the experiment to prove semiconservative $DNA$ replication?

Given below are two statements,one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ $\text{DNA}$ replication occurs within a small opening of the $\text{DNA}$ helix,referred to as the replication fork.
Reason $(R):$ During transcription,the discontinuously synthesized fragments of $\text{DNA}$ are joined by the enzyme $\text{DNA}$ ligase.
In the light of the above statements,choose the most appropriate answer from the options given below: