Question

Which result is false according to Griffith's experiment?

• A. S Strain $\to$ Mice die
• B. R strain $\to$ Mice live
• C. $\underset{\text{(Heat killed)}}{\text{S Strain}}$ $\to$ Mice live
• D. $\underset{\text{(Heat killed)}}{\text{S Strain}}$ + $\underset{\text{(Live)}}{\text{R Strain}}$$\to$ Mice live

Answer 1

The correct option is D $\underset{\text{(Heat killed)}}{\text{S Strain}}$ + $\underset{\text{(Live)}}{\text{R Strain}}$$\to$ Mice live

Mice injected with S strain dies because it is the virulent form.

Mice injected with the R strain live because R strain is avirulent and is easily detected by the immune system of the mice and is killed.

Mice injected with heat killed S strain lives.

The mice injected with heat killed S strain and live R strain die because DNA from virulent S Strain is transformed into R Strain & R strain bacteria becomes virulent.