Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If h

Question

Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain becomes nonlethal. Type R Streptococcous pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The S strain would be transformed into the nonvirulent R strain and kill the host.
B. The R strain would be transformed into the virulent S strain and kill the host.
C. The S strain would be transformed into the nonvirulent R strain and not affect the host.
D. The R strain would be transformed into the virulent S strain and not affect the host.
E. Neither the S nor the R strain would change.

Explanation / Answer

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B. The R strain would be transformed into the virulent S strain and kill the host.

This is the classic 1928 experiment by British bacteriologist Frederick Griffith. Important one might I add..

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