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A) transforming principle given by Griffith. He worked on streptococcus pneumonae
B) bacteriophages used by hershey and chase to prove dna as genetic material
C) Rnase and Dnase used by Avery, McLeod and MacCarty to prove biochemical nature of genetic material
D) N15 which is a radioactive isotope used by Meselson and Stahl to prove semiconservative nature of dna.
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