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Q.

A radioactive isotope used to label DNA differentially from protein is

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a

 32P

b

 14C

c

 35S

d

 15N

answer is A.

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Detailed Solution

Harshey and Chase worked to discover whether it was protein or DNA from the viruses that entered the bacteria. They grew some viruses on a medium that contained radioactive phosphorus (32P) and some others on medium that contained radioactive sulphur (35S). Viruses grown in the presence of 32P contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not

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