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  4. Bacteria were cultured in a medium containing heavy nitrogen (15N) until all the DNA was labelled. These bacteria were then grown in a medium containing only normal nitrogen (14N) for five generations. The percentage of cells 1 containing 15N in each generation was estimated. Which curve provides evidence that DNA replication is semi-conservative? <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/132cd0e76c7cf4daf0869e051736f989-.jpeg />

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Q. Bacteria were cultured in a medium containing heavy nitrogen ($^{15}N$) until all the $DNA$ was labelled. These bacteria were then grown in a medium containing only normal nitrogen ($^{14}N$) for five generations. The percentage of cells $1$ containing $^{15}N$ in each generation was estimated. Which curve provides evidence that $DNA$ replication is semi-conservative?
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Molecular Basis of Inheritance

Solution:

Correct answer is (c) III