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Select all the correct statements regarding the results of Frederick Griffith's 1928 experiment involving *Streptococcus pneumoniae*.

A. The non-pathogenic strain became pathogenic when mixed with heat-killed pathogenic strains.

B. The pathogenic strain remained pathogenic even when mixed with heat-killed non-pathogenic strains.

C. The heat-killed pathogenic strain transformed the non-pathogenic strain into a pathogenic one.

D. The heat-killed non-pathogenic strain transformed the pathogenic strain into a non-pathogenic one.

Answer :

Final answer:

Griffith's experiment demonstrated the transformation of a non-pathogenic strain into a pathogenic one through the transfer of genetic material. Correct Statements are a) The non-pathogenic strain became pathogenic when mixed with heat-killed pathogenic strains and c) The heat-killed pathogenic strain transformed the non-pathogenic strain into a pathogenic one.

Explanation:

Correct Statements:

  1. a) The non-pathogenic strain became pathogenic when mixed with heat-killed pathogenic strains.
  2. c) The heat-killed pathogenic strain transformed the non-pathogenic strain into a pathogenic one.

Griffith's 1928 experiment with Streptococcus pneumoniae showed that the transfer of genetic material occurred between the heat-killed pathogenic strain (S strain) and the non-pathogenic strain (R strain), resulting in the transformation of the R strain into a pathogenic one.

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