DNA is the genetic material. The final proof | vedclass

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(B) The unequivocal proof that $DNA$ is the genetic material came from the experiments of Alfred Hershey and Martha Chase $(1952)$.They worked with ba

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Hershey and Chase

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(B) The unequivocal proof that $DNA$ is the genetic material came from the experiments of Alfred Hershey and Martha Chase $(1952)$.They worked with bacteriophages,which are viruses that infect bacteria.They grew some viruses on a medium that contained radioactive phosphorus $(^{32}P)$ and some on a medium that contained radioactive sulfur $(^{35}S)$.Viruses grown in the presence of radioactive phosphorus contained radioactive $DNA$ but not radioactive protein because $DNA$ contains phosphorus but protein does not.Similarly,viruses grown on radioactive sulfur contained radioactive protein but not radioactive $DNA$ because $DNA$ does not contain sulfur.When these radioactive phages were allowed to infect $E. coli$ bacteria,it was observed that only the radioactive phosphorus $(^{32}P)$ entered the bacterial cells,indicating that $DNA$ is the genetic material that is transferred from the virus to the bacteria.

$DNA$ is the genetic material. The final proof for this came from the experiments of:

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