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Unformatted text preview: dead bacteria w/ polysaccharide coating mixed w/ live bacteria w/o polysaccharide coating to form live bacteria w/ polysaccharide coating transformation- transfer of genetic material from one cell to another Avery experiments- found the transforming principle from Griffith s experiments removed nearly all of the protein in S. pneumoniae, but transformation still occurred purified mixture contained elements close to that of DNA, had same density taking out lipids/proteins didnt stop transformation DNA-digesting enzyme DNase stopped all transformations showed that DNA provided hereditary material for bacteria Hershey-Chase experiment- studied bacteriophages, viruses that infect bacteria viruses - contain DNA or RNA surrounded by protein coat o causes cells to produce so many viruses that it bursts (lyses) used radioactive isotopes to track DNA and protein coat showed that DNA caused changes in cells, not protein...
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- Fall '10