Question
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.
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Molecular Basis of Inheritance. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
More Molecular Basis of Inheritance Questions
Which scientist conducted an experiment with 32P and 35S labelled phages for demonstrating that DNA is the genetic material?
The method of DNA replication in which two strands of DNA separate and synthesize new strands is called:
Which one of the following experiments of Frederick Griffith resulted in the discovery of bacterial transformation?
Given below are two statements: Statement I: In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable. Statement II: DNA evolved from RNA and is a more stable genetic material. Its double helical strands being complementary, resist changes by evolving repairing mechanism. In light of the above statements, choose the most appropriate answer from the options given below:
What is the role of RNA polymerase III in the process of transcription in Eukaryotes?
Which experimental material was used by Taylor and colleagues to prove that DNA in chromosomes replicates semiconservatively?
Which of the following is not a cloning vector?
The association of histone H1 with a nucleosome indicates:
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