Assume you grow bacteria in a medium containing radioactive phosphorous,so all t

Question

Assume you grow bacteria in a medium containing radioactive phosphorous,so all their dna is labeled, and then you transfer them to a medium containing only nonradioactive phosphorous. After precisely one cell division (including one DNA replication) in the nonradioactive medium, you test the bacterial DNA for radioactivity. What proportion of the DNA would be radioactive? Defend your answer.

A. None of the DNA would be radioactive

B. All the DNA would be radioactive

C. Half the DNA would be radioactive

D. None of these

Explanation / Answer

Half of DNA would be radioactive due to semi-conservative nature of DNA replication. One strand will show radioactivity out of two. Option C is correct.

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