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
AIPMT 1993, Medium
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b
(b) After two divisions, four bacterial cells are formed in which two daughter bacterial cells have normal $DNA$ and other two have both normal and
(b) After two divisions, four bacterial cells are formed in which two daughter bacterial cells have normal $DNA$ and other two have both normal and
heavy $DNA$ because $DNA$ replicates by semiconservative method in bacteria.
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