Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A): Semiconservative replication was experimentally proved by Mathew Meselson and Franklin Stahl (1958) Reason (R): Meselson and Stahl used radioactive isotope 15N and equilibrium density gradient centrifugation technique.
In the light of the above statements, choose the correct answer from the options given below:
(A) is True but (R) is False.
(A) is False but (R) is True.
Both (A) and (R) are True and (R) is the correct explanation of (A).
Both (A) and (R) are True but (R) is not the correct explanation of (A).
According to the text, Assertion (A) is correct because Matthew Meselson and Franklin Stahl indeed experimentally proved semiconservative DNA replication in 1958. However, Reason (R) is incorrect because the text explicitly notes that 'N is not a radioactive isotope', but rather the heavy isotope of nitrogen. It is separated from N based on density differences using CsCl density gradient centrifugation.
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