In $DNA$ replication,a primer is a...

The enzyme $DNA$ polymerase in $E. coli$ is a $DNA$-dependent polymerase and also has the ability to proof-read the $DNA$ strand being synthesized. Explain. Discuss the dual polymerase activity.

Give scientific reasons: $DNA$ replication is a semi-conservative process.

What is the small opening region of the $DNA$ helix where replication occurs called?

During replication of $DNA$, the $RNA$ primers are removed by i and replaced by $DNA$ sequences with the help of ii in prokaryotes and iii in eukaryotes.

For how long should bacteria be cultured in a $^{14}N$ medium after being transferred from a $^{15}N$ medium so that the extracted $DNA$ consists of equal amounts of hybrid $DNA$ and light $DNA$?