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Unformatted text preview: mutations in R-strain bacteria. Evidence # 3 Bacteriophages (viruses that invade bacteria and convert the bacteria into virus making machines) proved to be the means by which the question was finally answered. In 1952, Hershey and Chase (and others) confirmed that DNA was the genetic molecule. Viruses have just DNA (or sometimes just RNA) and a protein coat. Proteins contain sulfur, but not phosphorus and DNA contains phosphorus, but not sulfur. Hershey and Chase used radioactive sulfur and radioactive phosphorus to "label" T 2 bacteriophages (viruses that infect bacteria). They then tracked the invasion of phages into host bacteria (a strain of E coli) to determine what part of the new generation phages became radioactive. Since only the DNA of the new generation of phages was radioactive, Hershey and Chase were able to confirm that DNA was the genetic molecule....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10