alleryIn Griffith's transformation experiment with Streptococcus pneumoniae, mice died when injected with which combination?
ALive R strain alone
BHeat-killed S strain alone
CLive R plus heat-killed R
DLive R plus heat-killed S
Answer & Solution
Correct answer: D. Live R plus heat-killed S
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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