Question

QUESTION 2 ow did Grifth perfrm his transformation experiments? O He mixed a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain to convert some of the living cells into the pathogenic form. O He infected mice with a pathogenic strain of bacteria to test whether the mice can become resistant to the pathogen (i.e., they are transformed). O He mixed strains together to test which grew the fastest. O He mixed two pathogenic strains of bacteria to test whether the strains could compete with each other None of the above is true

Answer 1

Griffith mixed a heat-killed pathogenic strain of bacteria with a living non-pathogenic strain to convert some of the living cells into the pathogenic form.

Living S cells Living R cells Heat-killed S cells Living R cells plus heat-killed S cells Mouse contracts pneumonia Mouse remains healthy Mouse remains healthy Mouse contracts pneumonia R colonies isolated from tissue R and S colonies isolated from tissue of dead mouse S colonies isolated from tissue of dead mouse No colonies isolated from tissue The Griffith's experiment demonstrating bacterial transformation