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a) Write the conclusin drawn by Griffith at the end of his experiment with Streptococcus pneumoniae.
b) How did O.Avery, C.MacLeod and M. McCarty prove that DNA was the genetic material? Explain.

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He concluded that the R strain bacteria had somehow been transformed by the heat killed S strain bacteria. Heat killed S strain enabled the R strain to synthesis a smooth polysaccharide coat and become virulent.

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