The unequivocal proof that DNA is the genetic | vedclass

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(A) Alfred Hershey and Martha Chase $(1952)$ conducted experiments using bacteriophages,which are viruses that infect bacteria.They grew some viruses

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(A) Alfred Hershey and Martha Chase $(1952)$ conducted experiments using bacteriophages,which are viruses that infect bacteria.They grew some viruses in a medium containing radioactive phosphorus $(^{32}P)$ to label $DNA$ and others in a medium containing radioactive sulfur $(^{35}S)$ to label proteins.These viruses were allowed to infect $Escherichia$ $coli$ bacteria.After infection,the viral coats were removed from the bacteria by agitation in a blender and centrifugation.They observed that radioactive phosphorus $(^{32}P)$ was found inside the bacterial cells,indicating that $DNA$ had entered the bacteria.Conversely,radioactive sulfur $(^{35}S)$ was found only in the supernatant,indicating that proteins did not enter the bacteria.Thus,they provided unequivocal proof that $DNA$ is the genetic material.

The unequivocal proof that $DNA$ is the genetic material came from the experiments of Hershey and Chase. They worked on which of the following?

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