Frederic Griffith discovered transformation in his experiments on mice and Pneumococcus bacteria. He injected the mice with combinations of harmless, R-strain bacteria and disease-causing S-strain bacteria. Which combination of bacteria killed the mice and showed that transformation occurred?
A.
heat-killed R-strain and live S-strain
B.
heat-killed S-strain and live R-strain
C.
heat-killed bacteria of both strains
D.
live bacteria of both strains
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