Who proposed the transforming principle?

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(D) Frederick Griffith conducted a series of experiments with $Streptococcus$ $	ext{pneumoniae}$ in $1928$. He observed that a non-virulent strain of

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Griffith

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(D) Frederick Griffith conducted a series of experiments with $Streptococcus$ $	ext{pneumoniae}$ in $1928$. He observed that a non-virulent strain of bacteria could be transformed into a virulent strain when mixed with heat-killed virulent bacteria. He called this phenomenon the 'transforming principle'. Although he could not identify the biochemical nature of the transforming substance, his work laid the foundation for the discovery of $DNA$ as the genetic material.

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