試題詳解

10.The antiparallel polarity of the two DNA strands within the double helix affects DNA replication in that
(A) it takes twice as long to replicate two strands sequentially from 5' to 3'.
(B)circular bacterial DNA does not have polarity, so a single strand can be copied twice.
(C) DNA polymerases on each strand synthesize DNA in the 5'-to-3' direction, and one strand is synthesized discontinuously.
(D) each portion of the double helix must be unwound twice so that both strands are replicated continuously.

(E) Only one strand of DNA at any replication origin can be synthesized.