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Q.

The scientist Avery, MacLeod and McCarty are famous for

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a

identifying RNA as genetic material

b

giving chemical nature of RNA

c

revealing chemical nature of transforming principle

d

giving double helical structure of DNA

answer is C.

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Detailed Solution

Avery ,Macleod and McCarty  purified biochemicals (proteins, DNA, RNA, etc.) from the heat-killed S cells to see which ones could transform live R cells into S cells. They discovered that DNA alone from S bacteria caused R bacteria to become transformed and they revealed chemical nature of transforming principle  is DNA .
 

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