What was observed when centrifugation was done for the set of bacteria infected with bacteriophage grown on radioactive sulphur?

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No radioactivity was detected in the cells, but radioactivity was detected in the supernatant

Radioactivity was detected in cells, but no radioactivity was detected in the supernatant

Radioactivity was detected both in cells as well as supernatant.

No radioactivity was detected in the cells or supernatant

answer is A.

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Detailed Solution

Sulphur is present only in the protein coat and not the DNA. As DNA is the genetic material therefore it is transferred from virus to the bacteria and not the protein. Therefore, when centrifugation was done for the set of bacteria infected with bacteriophage grown on radioactive sulphur no radioactivity was detected in the cells but radioactivity was detected in the supernatant.

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