d (d)A unique property of $DNA$ is that it governs its own synthesis. The copying process of $DNA$ to produce additional $DNA$ molecules is called replication.
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Bacteria were grown in a medium containing heavy isotope of nitrogen ($N^{15}$) for many generations and all their $DNA$ contained many heavy nitrogen only. A bacterium of this type was transferred to normal medium and allowed to duplicate. After two divisions of heavy $DNA$ is likely to be that