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In Griffith's experiment, mice injected with live R strain plus heat-killed S strain bacteria
Asurvived because heat-killed bacteria cannot infect
Bdied only when the S strain was R-strain too
Cdied, and live S strain bacteria were recovered from them
Ddeveloped immunity to both strains
Answer & Solution
Correct answer: C. died, and live S strain bacteria were recovered from them
The mice died and live S bacteria turned up in their blood — even though only dead S had been injected. Something from the dead S strain had 'transformed' the live R strain into virulent S. Avery would later identify that something as DNA.
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