Q.

In Meselson and Stahl experiment, 15N can only be differentiated on the basis of

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a

radioactivity

b

radioactive

c

physical observation

d

density gradient

answer is D.

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Detailed Solution

Heavy DNA molecule could be distinguished from the normal DNA by centrifugation in a cesium chloride (CsCl) density gradient, 15N is not a radioactive isotope, and it can be separated from 14N only based on densities.
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