15. Compared with DNA polymerase, reverse transcriptase
(A) does not require a primer to initiate synthesis.
(B) makes more errors because it lacks the 3' to 5' proofreading exonucleaseactivity.
(C) introduces no errors into genetic material because it synthesizes RNA,not DNA.
(D) synthesizes complementary strands in the opposite direction from 3' to 5'

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