Bacterial cells with DNA containing only the ‘heavy’ isotope of nitrogen $\left( {{}^{15}N} \right)$ are allowed to reproduce for three generations in a culture medium containing the normal isotope of nitrogen $\left( {{}^{14}N} \right)$.
Which percentage of the DNA molecules produced contain strands with the heavy isotope of nitrogen?

1 )
A
2 )
B
C
4 )
D
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