Question

Identify the correct pair of combinations.
I. ${}^{14}C$ - Distinction between PS-I and PS-II.
II. ${}^{15}N$ - Semiconservation replication of DNA.
III. ${}^{35}S$ - Polypeptide synthesis.
IV. ${}^{32}C$ - Identification of chemical nature of genetic material

• A. II and III
• B. II and IV
• C. I and II
• D. I and III

Answer 1

The correct option is A II and III

${}^{15}N$ isotope was used by Meselson and Stahl to experimentally determine the semi-conservative method of DNA replication. Hence, is the correct answer.
${}^{14}C$ was used by Dr. Calvin to trace the metabolic fate of carbon during photosynthesis.
${}^{35}S$ was used in the Hershey and Chase experiment to prove that the genetic material is DNA.
${}^{32}P$ was the isotope used in the Hershey and Chase experiment which proved that DNA and not protein, was the genetic material.