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In Griffith's transformation experiment with Streptococcus pneumoniae, mice died when injected with which combination?
A{'text': 'Live R strain alone', 'label': 'A'}
B{'text': 'Heat-killed S strain alone', 'label': 'B'}
C{'text': 'Live R plus heat-killed R', 'label': 'C'}
D{'text': 'Live R plus heat-killed S', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Live R plus heat-killed S', 'label': 'D'}
Live R is avirulent; heat-killed S is also harmless. But heat-killed S plus live R killed mice and live S could be recovered, showing R was transformed by a 'transforming principle' from dead S cells.
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