DNA Structure and Replication
The rapid appearance of HIV-1 strains that are resistant to AIDS drugs is due in part to which of the following property of its reverse transcriptase?

AZT (zidovudine) is too expensive to be taken in effective doses
The RNase H domain of p66 causes error prone synthesis
It lacks a proofreading exonuclease
It has low affinity for the correct dNTP's

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DNA Structure and Replication
Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that

only one chromatid of a chromosome was labeled
both chromatids of a chromosome were labeled
neither chromatid was labeled
both (a) and (b)

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