DNA Structure and Replication
The size of a linear DNA fragment in a gel can be estimated by

comparison with a molecular weight standard such as Hind III digested phage lambda
fluorescence in UV light
the sedimentation coefficient
the time it takes the gel to run

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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

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

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DNA Structure and Replication
The B-DNA structure found in solution is a

right-handed double helix of antiparallel chains (∼10 bp/turn)
left-handed zig-zag helix of antiparallel chains (10 bp/turn)
left-handed double helix of antiparallel chains (10 bp/turn)
right-handed double helix of parallel chains (∼10 bp/turn)

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