Who discovered the synthesis of $DNA$ from $RNA$ in Rous sarcoma virus?

Which one of the following correctly represents the manner of replication of $DNA$?

Name a few enzymes involved in $DNA$ replication other than $DNA$ polymerase and ligase. Name the key functions for each of them.

Where does the replication of $DNA$ begin?

$E. coli$ has only $4.6 \times 10^{6}$ base pairs and completes the process of replication within $18$ minutes; then the average rate of polymerisation is approximately

What is the error in the above diagram?