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Injecting mice with live R strain mixed with heat-killed S strain resulted in:
AThe bacteria dying
BThe mice dying
CThe mice recovering
DNo change at all
Answer & Solution
Correct answer: B. The mice dying
1. Live R alone was harmless and heat-killed S alone was harmless.
2. In a third set of experiments, a mixture of live R strain and heat-killed S strain were injected into mice.
3. To Griffith's surprise, the mice died.
4. Something from the dead S cells had converted the live R cells into a pathogenic form.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 14 'DNA Structure and Function', sections 14.1-14.6_
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