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(A) Frederick Griffith performed a series of experiments in $1928$ using the bacterium $Streptococcus 	ext{ } pneumoniae$ (also known as $Pneumococcu

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Pneumococcus

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(A) Frederick Griffith performed a series of experiments in $1928$ using the bacterium $Streptococcus 	ext{ } pneumoniae$ (also known as $Pneumococcus$).He used two strains of this bacterium: $S$-strain (virulent, smooth, encapsulated) and $R$-strain (non-virulent, rough, non-encapsulated).Through his experiments on mice, he observed the phenomenon of bacterial transformation, where the $R$-strain bacteria were transformed into $S$-strain bacteria by a 'transforming principle' released from heat-killed $S$-strain bacteria.Therefore, the correct organism used in his experiments was $Pneumococcus$.

Frederick Griffith performed a series of experiments on which of the following organisms?

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