Describe in detail the chemical structure of DNA, how DNA is replicated, and the experiment by Meselson and Stahl that determined the method of DNA replication
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Meselson and Stahl tested the hypothesis of DNA replication. They cultured bacteria in a 15N medium. 15N is a heavy isotope of nitrogen so the DNA synthesized is of heavy density. They then shifted the bacteria to a 14N medium, DNA was isolated at different times corresponding to replication cycles 0, 1, and 2.
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