DNA Structure and Replication
In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band

all of these
above DNA containing 14N
with 14N-containing DNA
below DNA containing 14N

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

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