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Which of the following things was identified as the transforming principle?

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Which of the following things was identified as the transforming principle?

(a) DNA

(b) RNA

(c) Protein

(d) Carbohydrates

I have been asked this question in final exam.

This question is from Genetic Recombination topic in chapter Genetic Recombination of Drug Biotechnology

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Right answer is (a) DNA

For explanation: Griffith showed in his experiment that DNA was the transforming principle that transformed the living rough bacteria into pathogenic smooth ones. He used two types of bacteria one with rough membrane and other with a smooth membrane.

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