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NEET 2023, Biology Q10: Nucleic acids (DNA and RNA)

NEET2023Biology
Q.

Unequivocal proof that DNA is the genetic material was first proposed by:

  1. A

    Frederick Griffith

  2. B

    Alfred Hershey and Martha Chase

  3. C

    Avery, Macleod and McCarthy

  4. D

    Wilkins and Franklin

Solution

The Hershey-Chase experiments with radioactively labelled bacteriophage T2 (P for DNA, S for protein) showed conclusively in 1952 that only the DNA entered the bacterial host and directed phage replication. Griffith's transformation experiments and Avery's biochemical follow-up pointed in this direction but did not provide the same unambiguous proof.

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