Scientists grew bacteria in a medium containing heavy nitrogen, ${}^{15}N$, as the only source of
nitrogen.
After many generations, all of the bacterial DNA contained heavy nitrogen.
These bacteria were then moved from the heavy nitrogen medium into a medium with only light
nitrogen, ${}^{14}N$.
Some bacteria were collected from each of the next three generations and their DNA was analysed.
Hybrid DNA contains both heavy and light nitrogen.
Which row shows the correct DNA of the first and third generations?
1 )
A
B
3 )
C
4 )
D
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