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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DNA Structure and Replication
Nucleosome is

an hexamer of three histones with H1 protein
an octamer of four histones without H1 protein
an hexamer of three histones without H1 protein
an octamer of four histones with H1 protein

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