Q.

If DNA contained sulphur instead of phosphorus and proteins contained phosphorus instead of sulphur, what would have been the outcome of Hershey and Chase’s experiment?

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a

Radioactive phosphorus in bacterial cells 

b

Radioactive sulphur in bacterial cells

c

Both radioactive sulphur and phosphorus in bacterial cells

d

No radioactive sulphur in bacterial cells

answer is C.

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Detailed Solution

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If DNA contained sulphur instead of phosphorus and proteins contained phosphorus instead of sulphur, then radioactive sulphur will be present in bacterial cells. This is because the genetic material of the virus will be transferred into the bacteria and, in this case, the DNA will contain sulphur, so it will be transferred into the cell.
(1) Radioactive sulphur will be present in bacterial cells.
(2), (4) Only radioactive sulphur will be present in bacterial cells; not radioactive phosphorus.

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