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

If $E. coli$ is allowed to grow for $40$ minutes in a medium containing $^{15}N$,then the number of $^{14}N / ^{14}N$ containing $DNA$ molecules would be:

$DNA$ replication in the lagging strand of most eukaryotic organisms is

$E. coli$ cells were allowed to replicate in a medium containing radioactive thymidine for $5$ minutes and then transferred to a normal medium for further replication. Which of the following observations will be correct?

During $DNA$ replication,which of the following does not act as a substrate?

Which one statement regarding "Okazaki fragments" is correct?