Unwinding of $DNA$ creates tension which is released by enzyme:

Given below are two statements.
Statement $I$ - The template strand with free $3'$ end is called leading template and the strand with free $5'$ end is called lagging template.
Statement $II$ - Replication always starts at the $3'$ end of the template strand and proceeds towards the $5'$ end of the template.
In the light of the above statements,select the correct option given below:

$A$ normal spontaneous rate for a single gene is one mutation in every ...... replications.

During $DNA$ replication,the addition of nucleotides on the lagging strand occurs:

Which of the following diagrams correctly represents the process of $DNA$ replication at the replication fork?

$DNA$ is synthesized from viral $RNA$ using the enzyme: