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

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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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