Mice that are injected with only the R strain of Streptococcus pneumoniae… A) stay healthy, because their immune systems can kill this strain easily. B) become sick for prolonged periods of time. C) are killed, because R strain cells are deadly.

Mice that are injected with only the R strain of Streptococcus pneumoniae…
A) stay healthy, because their immune systems can kill this strain easily.
B) become sick for prolonged periods of time.
C) are killed, because R strain cells are deadly.

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Sourav PanDecember 7, 2024

Answered

A) stay healthy, because their immune systems can kill this strain easily: The R strain of Streptococcus pneumoniae is non-virulent and does not cause disease in mice.

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