LIFE SCIENCE

Detailed explanation-1: -The Hershey–Chase experiments were a series of experiments conducted in 1952 by Alfred Hershey and Martha Chase that helped to confirm that DNA is genetic material.

Detailed explanation-2: -Hershey and Chase labeled bacteriophage DNA with radioactive phosphorus. When the phage was allowed to infect bacteria, the DNA entered the bacterial cell, showing that DNA represented the genetic material responsible for the inheritance of traits.

Detailed explanation-3: -Generally proteins contain sulphur but not phosphorous and nucleic acid (DNA) contains phosphorous but not sulphur. Hence Hershey-Chase used radioactive isotopes of sulphur S) and phosphorus (P) to keep separate track of viral protein and nucleic acid in culture medium.