BotanyWhich of the following strains of Pneumococcus when injected to mice will cause death of that mice?

Which of the following strains of Pneumococcus when injected to mice will cause death of that mice?

  1. A

    Live R-strain.

  2. B

    Live S-strain.

  3. C

    Heat-killed R-strain.

  4. D

    Heat-killed S-strain.

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    Solution:

    Live S- strains of Pneumococcus are virulent. They cause death of mice when injected.

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