Frederick Griffith heat-killed a culture of pathogenic bacteria. He split the sample and injected half of it into mice. The mice lived. He then mixed the other half with a living, nonpathogenic bacteria strain and injected the mixture into mice. The mice died. These results best support which of the following conclusions.
1. the initial heat treatment was unsuccessful
2. a substance had been transferred from pathogenic to nonpathogenic bacteria
3. splitting the culture revived the pathogenic bacteria
4. non-pathogenic bacteria were transformed by pathogenic capsule proteins

The results by Frederick Griffith experiment best support the conclusion that: (2) a substance had been transferred from pathogenic to nonpathogenic bacteria.

Pathogenic refers to the state where a living microorganism possess the ability to cause infection in some other living organism. This phenomenon of microorganisms of causing infection is called pathogenicity. Bacteria, viruses, protozoans are all pathogenic in nature.

Bacteria is the prokaryotic microorganism found in all the environments. There are two types of bacteria: the good ones and the bad ones. The bacteria can even be found inside the body of living organisms. The examples of bacteria are: E. coli, Salmonella, Bacillus, etc.

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