Correct option (b) Hershey and Chase
Explanation
The final proof that DNA is the genetic material came from the experiments of Alfred Hershey and Martha Chase (1952). Griffith'* experiment proved the existance of genetic material while Avery, MacLeod and McCarty worked to determine the biochemical nature of transforming principle.
Concept Enhancer Hershey and Chase during their experiment, grew viruses in two mediums, one containing 32P and other 35S, when these were allowed to infect bacteria, they observed that viruses containing 32P DNA were radioactive while those with 35S protein were not radioactive. Hence, DNA not protein coat entered bacterial cells from viruses.
