In a famous experiment, matthew meselson and franklin stahl grew e. coli cells in a medium containing only the "heavy" isotope of nitrogen, 15 n . these cells were then transferred to a medium with the "light" isotope of nitrogen, 14 n . the results of the experiment supported the hypothesis of semiconservative replication, which was proposed by watson and crick. heavy dna ( 15 n dna), hybrid dna, and light dna ( 14 n dna) can be separated by centrifugation. if cells containing 15 n dna are transferred to a medium with only 14 n nh 4 cl as a nitrogen source, what percent of daughter molecules are composed of hybrid dna after 3 generations?
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