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Biology Unit 4 DNA and Cell Division

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Who is Griffith and what did he do?
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combined living R bacteria with extract from S bacteria, this allowed them to observe the transformation, purified extract, performed qualitative test, chemical analysis, and enzyme tests, transformation failed to occur when an enzyme that destroyed DNA was added, so identified DNA as the transforming principle
confirmed DNA is genetic material, used a virus called "phage" or bacteriophage which takes over a bacterium's genetic machinery and directs it to create more viruses, performed two experiments, the results showed the phages' DNA had entered the bacteria, but the protein hadn't entered, this convinced scientists that genetic material is DNA and not proteins