DNA Structure and Replication
During conventional transformation experiments E. coli cells and plasmid DNA interacts in an environment of

high temperature and Mg++
low temperature and Ca++
high temperature and Ca++
low temperature and Mg++

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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 chromatids of a chromosome were labeled
only one chromatid of a chromosome was labeled
both (a) and (b)

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

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

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