A) Mice survived and showed live S cells
B) Mice died and showed live S cells
C) Mice survived and showed live R cells
D) Mice died and showed live R cells
Correct Answer: B
Solution :
[b] As a part of his experiments, Griffith tried injecting mice with heat-killed S bacteria. Unsurprisingly, the heat-killed S bacteria did not cause disease in mice. However, when harmless R bacteria were combined with harmless heat-killed S bacteria and injected into a mouse, the mouse develop pneumonia and died. When Griffith took a blood sample from the dead mouse, he found that it contained living S bacteria.
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