Griffith's observations from his experiments infecting mice with smooth and rough strain Streptococcus pneumoniae were later found to be due to

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Griffith's observations were due to the process of transformation, which is the uptake of DNA by a bacterial cell from its surroundings. The rough strain was transformed into the smooth strain, leading to the ability to produce a capsule and cause disease in mice. Conjugation involves the transfer of genetic material between bacterial cells, transposition involves the movement of genetic elements within a genome, and transduction involves the transfer of genetic material between bacteria via viruses.

Griffith's Observations from His Experiments Infecting Mice with Smooth and Rough