DNA Structure and Replication
The overall conclusion of the Hershey-Chase experiment was that

the ratio of Adenine to thymine was always the same
phage DNA was similar to bacterial DNA
proteins and DNA were responsible for heredity
DNA was responsible for heredity

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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?

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

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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

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

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