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(D) In Frederick Griffith's transformation experiment,two strains of Streptococcus pneumoniae were used:$1$. $S$ strain (Smooth): These bacteria have

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Rough and non-virulent

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(D) In Frederick Griffith's transformation experiment,two strains of Streptococcus pneumoniae were used:$1$. $S$ strain (Smooth): These bacteria have a mucous (polysaccharide) coat and are virulent,meaning they cause pneumonia.$2$. $R$ strain (Rough): These bacteria lack the mucous coat and are non-virulent,meaning they do not cause pneumonia.Therefore,the $R$ strain is characterized as rough and non-virulent.

Select the correct option for the $R$ strain of bacteria.

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