After several generations of labeling cells in 15N media, the cells are switched to 14N media for one generation. The DNA extracted after one generation in 14N media was centrifuged in a cesium gradient. The DNA formed a single band with a density somewhere between DNA grown in 15N media and DNA grown in 14N media. This data is consistent with which replication model:
A) conservative replication only
B) conservative and dispersive replication
C) semiconservative replication only
D) dispersive replication only
E) semiconservative and dispersive replication
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