Bacteria were cultured in a medium containing heavy nitrogen ($^{15}N$) until all the DNA was labelled. These bacteria were then grown in a medium containing only normal nitrogen ($^{14}N$) for five generations. The percentage of cells containing $^{15}N$ in each generation was estimated.
Which curve provides evidence that DNA replication is semi-conservative?
1 )
A
2 )
B
C
4 )
D
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