Biology - Molecular Basis of Inheritance Question with Solution | TestHub
Which one of the following experiments by Griffith withStreptococcus pneumoniae, resulted in the death of mice due to pneumonia?
Options:
Answer:
Solution:
Frederick Griffith conducted a series of experiments withStreptococcus pneumoniaeto demonstrate bacterial transformation.
When mice were injected with the live S strain (virulent), they died from pneumonia.
When injected with the live R strain (non-virulent), they survived.
When injected with the heat-killed S strain, they survived.
When injected with a mixture of live R strain and heat-killed S strain, the mice died. This occurred because some transforming principle from the heat-killed S strain enabled the live R strain to synthesize a smooth polysaccharide coat and become virulent.
Therefore, the injection of live R strain and heat-killed S strain resulted in the death of the mice.
Answer: Mice injected with live R strain and heat killed S strain.
