Remember that this experiment involved E.coli that were first cultured in medium containing 15N-labeled nucleotide precursors. They were the transferred to a different medium, now containing 14N-containing nucleotide precursors.
The mechanism of replication was determined by Meselson and Stahl. Imagine if their data had turned out differently. Which model would be supported by these hypothetical results?
Original : 1 band of N15 only
1st generation : 1 band of N15/N14
2nd generation : 1 band of N15/N14
D. Cannot tell from this data alone
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