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(C) Hershey and Chase conducted experiments using bacteriophages to prove that $DNA$ is the genetic material.They grew some viruses on a medium contai

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Phosphorus $;$ sulfur

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(C) Hershey and Chase conducted experiments using bacteriophages to prove that $DNA$ is the genetic material.They grew some viruses on a medium containing radioactive phosphorus $(^{32}P)$ to label the $DNA$,as $DNA$ contains phosphorus but not sulfur.They grew other viruses on a medium containing radioactive sulfur $(^{35}S)$ to label the proteins,as proteins contain sulfur (in amino acids like methionine and cysteine) but not phosphorus.Therefore,the correct radioactive elements used were phosphorus and sulfur.

Hershey and Chase grew some viruses on a medium that contained radioactive $.........$ and some others on medium that contained radioactive $.........$

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