Q.

When bacterium with its both DNA strands labelled with  N15 - N15 was allowed to replicate once in medium containing 14NH4Cl, and after cesium chloride density gradient centrifugation if a DNA band obtained in the centrifuge tube appears like the below one, it shows that

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a

the newly formed DNA is hybrid DNA and has intermediate density with each DNA molecule having one heavy strand and one lighter strand.

b

the newly formed DNA is lighter DNA and has low density

c

the newly formed DNA is heavy DNA and has high density.

d

DNA replicates in conservative manner.

answer is A.

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Detailed Solution

It shows that DNA replicates in semiconservative manner and the daughter DNA molecules have intermediate density and the DNA is described as hybrid DNA.
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