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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?
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- Half the number contain no radioactivity
- All four still contain radioactivity
- Three out of four contain radioactivity
- Radioactivity is lost from all four
Correct Option: A
DNA replication is semiconservative. i.e. at each replication one of the parental strands is retained and a new daughter strand is obtained. Thus only half of the parental DNA molecule is carried to the next generation.
