BotanyA DNA molecule of E.coli is heavy i.e. fully labelled with N  15 and is allowed to duplicate in a medium containing N  14. In first generation, the two daughter DNA molecules-

A DNA molecule of E.coli is heavy i.e. fully labelled with N  15 and is allowed to duplicate in a medium containing N  14. In first generation, the two daughter DNA molecules-

  1. A

    Have same density but do not resemble their parent DNA.

  2. B

    Have different densities but resemble their parent DNA.

  3. C

    Have different densities and also do not resemble the parent DNA.

  4. D

    Same in density and resemble their parent DNA.

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    Solution:

    From the image given below it is clear that the two daughter DNA molecules produced in the first generation have  N  15 in one strand and N  14 in another. Therefore, the two daughter DNA molecules have same density but do not resemble their parent DNA that has N  15 in both the strands.

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