Question

Transformation experiment was first performed
on which bacteria?
(a) E.coli
(b) Diplococcus pneumoniae
(c) Salmonella
(d) Pasteurella pestis

Answer 1

Answer:

b.

Explanation:

diplococcus pneumonia is the answer

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Answer 2

Transformation experiment was first performed on Diplococcus pneumoniae.

* For the first time, the transforming principle of bacterial genetics was shown by Frederick Griffith in the year 1928.

Experiment:

He took two different strains of Streptococcus pneumoniae- the R( rough) and S( smooth) strain.

Mice were injected with different variations of the strain and results observed:

1. R strain- mouse lives

2. S strain- mouse dead

3. Heat killed S strain- mouse lives

4. Heat killed S strain+ R strain- mouse dies.

Blood samples from these mice showed that it contained live S strain bacteria.

Thus, he concluded that the R strain has been transformed by the genetic material of the heat-killed S strain and become virulent.