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14/10/2021 7:16 pm
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If a completely radioactive double stranded DNA molecule undergoes two rounds of replication in a non-radioactive medium, what will be the radioactive status of the four resulting molecules?
(1) Three out of four contain radioactivity
(2) Half the number contain no radioactivity
(3) Radioactivity is lost from all four
(4) All four still contain radioactivity
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14/10/2021 7:17 pm
Correct answer: (2) Half the number contain no radioactivity