Meselson and Stahl concluded from these experiments that DNA replication was semi-conservative: the DNA strands split off and each replicated themselves, resulting in each daughter molecule having one "old" and one "new" strand.
Density would be a defining characteristic between the old and new DNA. Meselson and Stahl created an approach called equilibrium density gradient centrifugation to gauge a density difference in the DNA. With this procedure, a cesium chloride solution is added to a tube where the DNA is centrifuged.
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