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

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

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

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