Griffith's experiment showing the transformation of R strain Pneumococcus bacteria to \( \mathrm...

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Griffith's experiment showing the transformation of R strain Pneumococcus bacteria to \( \mathrm{S} \) strain Pneumococcus bacteria in the presence of heat-killed \( S \) strain bacteria gave evidence that
(a) an external factor was affecting the \( R \) strain bacteria
(b) DNA was definitely the transforming factor
(c) S strain bacteria could be reactivated after heat killing
(d) All of the above
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