20. DNA polymerase_________.
(A)synthesizes a short RNA segment to begin DNA replication
(B)adds nucleotides to the S' end of an existing strand to synthesize a new DNA strand
(C)adds nucleotides to the 3' end of an existing strand to synthesize a new DNA strand
(D) seals nicks between adjacent segments of DNA
(E) unwinds the DNA double helix at the origin of replication
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