A variety of drugs can alter DNA replication in eukaryotic cells. Which one of the following steps could be a target for such a drug? Choose the one best answer.
A.
The enzyme family of DNA polymerases, which unwinds parental strands
B.
The enzyme family of topoisomerases, which copy each parental strand in the 3 ′ -to-5 ′ direction
C.
The enzyme family of helicases, which copy each parental strand in the5 ′ -to-3 ′ direction
D.
The finding that both strands of newly synthesized DNA always grow continuously
E.
The enzyme DNA ligase, which joins Okazaki fragments