Meselson and Stahl investigated DNA replication by growing bacteria in a culture containing heavy nitrogen, ${}^{15}N$, until all the DNA was labelled.
These bacteria, the parental generation, were then transferred to a culture containing only light nitrogen, ${}^{14}N$, and allowed to replicate for two generations.
DNA was extracted from each generation of bacteria and its relative mass estimated. The flow diagram shows the results.
Which row explains the relative mass of the DNA in the second generation grown in ${}^{14}N$?
A
2 )
B
3 )
C
4 )
D
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