Where does the replication of $DNA$ begin?

Describe the enzymes involved in the process of $DNA$ replication.

Match the columns.

Column - $I$	Column - $II$
$(a)$ Helicase	$(1)$ Joining of nucleotides
$(b)$ Gyrase	$(2)$ Opening of $DNA$
$(c)$ Primase	$(3)$ Unwinding of $DNA$
$(d)$ $DNA$ Polymerase $III$	$(4)$ $RNA$ Priming

During in vitro synthesis of $DNA$,a researcher used $2', 3'$-dideoxy cytidine triphosphate as raw nucleotide in place of $2'$-deoxy cytidine. What would be the consequence?

What is the approximate rate of polymerization during $DNA$ replication in $E. coli$?

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