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Q.

Viruses of bacteria grown in the presence of radioactive phosphorus contained:

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a

Radioactive lipids

b

Radioactive DNA

c

Radioactive polysaccharides

d

Radioactive protein

answer is A.

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Detailed Solution

Viruses of bacteria grown in the presence of radioactive phosphorus contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not. Similarly, viruses grown on radioactive sulfur contained radioactive protein but not radioactive DNA because DNA does not contain sulfur. 

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