In Griffith's 1928 experiment on pneumococcus, which strain was virulent?
ARough and capsule-free
BSmooth and capsule-free
CRough and capsulated
DSmooth and capsulated
Answer & Solution
Correct answer: D. Smooth and capsulated
The smooth strain carries a polysaccharide capsule that hides it from the host immune system, so it kills the host.
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