Meselson and Stahl investigated DNA in bacteria. They grew bacteria in a medium with only heavy nitrogen, ${}^{15}N$, until all of the bacterial DNA was heavy.
These bacteria were moved from a heavy nitrogen medium and cultured in a medium with only light nitrogen, ${}^{14}N$.
A sample of bacteria was collected from the first generation and their DNA analysed.
Hybrid DNA contains heavy DNA and light DNA.
Which row shows the percentage of light DNA strands and the percentage of hybrid DNA molecules in the first generation produced in the medium containing light nitrogen?
1 )
A
2 )
B
C
4 )
D
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