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(A) The experiment described is the Meselson-Stahl experiment,which proves the semi-conservative nature of $DNA$ replication.$1$. Initially,the $E. co

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Different density and not similar to parental $DNA$.

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(A) The experiment described is the Meselson-Stahl experiment,which proves the semi-conservative nature of $DNA$ replication.$1$. Initially,the $E. coli$ $DNA$ is labeled with the heavy isotope $N^{15}$.$2$. When these bacteria are transferred to a medium containing the lighter isotope $N^{14}$,the first generation of $DNA$ molecules will consist of one strand of $N^{15}$ (parental) and one strand of $N^{14}$ (newly synthesized).$3$. This hybrid $DNA$ $(N^{15}N^{14})$ has an intermediate density compared to pure $N^{15}$ $DNA$ and pure $N^{14}$ $DNA$.$4$. Therefore,the $DNA$ strands have a different density compared to the original parental $DNA$ $(N^{15}N^{15})$ and are not similar to the parental $DNA$.

Escherichia coli is completely labeled with $N^{15}$ and then grown in an $N^{14}$ medium. What will be the nature of the two $DNA$ strands in the first generation of bacteria?

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