The final proof for DNA as the genetic materi | vedclass

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(A) The final proof that $DNA$ is the genetic material was provided by Alfred Hershey and Martha Chase in $1952$.They worked with bacteriophages,which

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Hershey and Chase

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(A) The final proof that $DNA$ is the genetic material was provided by Alfred Hershey and Martha Chase in $1952$.They worked with bacteriophages,which are viruses that infect bacteria.They grew some bacteriophages in a medium containing radioactive phosphorus $(^{32}P)$ to label the $DNA$ and others in a medium containing radioactive sulfur $(^{35}S)$ to label the protein coat.After allowing the phages to infect $E. coli$ bacteria,they agitated the mixture in a blender to remove the viral coats from the bacterial cells.They found that radioactive phosphorus $(^{32}P)$ was present inside the bacterial cells,indicating that $DNA$ had entered the cells,while radioactive sulfur $(^{35}S)$ remained outside,indicating that proteins did not enter the cells.This confirmed that $DNA$ is the genetic material.

The final proof for $DNA$ as the genetic material came from the experiments of

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