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In the late 1950s, Meselson and Stahl grew bacteria in a medium containing "heavy" (radioactive) nitrogen (15N) and then transferred them to a medium containing 14N, which is a less radioactive form of nitrogen. They then extracted DNA from the bacteria and centrifuged it to separate the DNA of different densities. Once the pattern found after one round of replication was observed, Meselson and Stahl could be confident of which of the following conclusions?
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