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The S-strain Pneumococcus bacteria had a smooth surface, because ____________________.

User J Pimmel
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The S strain Pneumococcus bacteria had a smooth surface because IT IS SURROUNDED BY A CARBOHYDRATE CAPSULE CALLED THE S STRAIN. The other form, the R strain has a rough surface and no capsule. It is only the S strain that exhibits virulence. 
User Bram Vandenbussche
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