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DNA was first...

Question

DNA was first proven to be the transforming factor in bacterial cells by

A

Meischer

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B

Watson and Crick

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C

Griffith

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D

Avery

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Solution

The correct option is D Avery
The first convincing evidence of the role of DNA in the heredity came from the experiments of Avery, MacLeod and McCarty, who showed that the genetic characteristics in bacteria could be altered from one type to another by the treatment with purified DNA. In the studies of Streptocpccus pneumonia, they transformed mutant cells unable to cause pneumonia into the cell that could do so by treating them with pure DNA disease causing forms.
So, the correct option is 'Avery'.

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