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18 October, 13:47

Suppose you want to radioactively label DNA but not RNA in dividing and growing bacterial cells. What radiolabeled molecule would you add to the culture medium? Why would it selectively label DNA but not RNA?

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  1. 18 October, 16:07
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    Tritiated thymine or tritiated thymidine

    Explanation:

    It would selectively label DNA but not RNA because of the presence of the uniformly labeled backbone phosphorus atoms in the DNA.
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