A radioactive isotope used to label DNA differentially from protein is

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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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