A) 50% radioactive, 50% non-radioactive
B) 50% non-radioactive
C) 50% radioactive
D) None of the above
Correct Answer: A
Solution :
Mathew Meselson and Franklin Stahl (1957) proved that DNA replication semiconservative. They obtained DNA strands, which were 50% radioactive and 50% non-radioactive. When replicated the radioactively labeled DNA into non radioactive DNA medium. Semiconservative model of DNA replication states that parental DNA separates into two strands and each strands acts as a template for synthesis of new strand. Thus, a daughter DNA will have one old and one new strand.
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