Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Which observation from Griffith's experiment with Streptococcus pneumoniae provided the strongest evidence for the existence of a 'transforming principle'?
Live non-virulent bacteria did not cause disease in mice.
Heat-killed virulent bacteria did not cause disease in mice.
Live virulent bacteria caused disease in mice.
Heat-killed virulent bacteria, when mixed with live non-virulent bacteria, caused the latter to become virulent.
In Griffith's experiment, which strain of Streptococcus pneumoniae caused the death of mice?
S strain (smooth)
R strain (rough)
Heat-killed S strain
Heat-killed R strain
What did Griffith observe when he injected a mixture of heat-killed S strain and live R strain bacteria into mice?
The mice died, and live S strain bacteria were recovered.
The mice survived.
The mice died, and live R strain bacteria were recovered.
The mice survived, and a new strain of bacteria was recovered.
Which of the following is NOT a key feature of the transforming principle, as demonstrated by Griffith?
It is composed of protein.
It can change the characteristics of bacteria.
It can be passed from one generation of bacteria to the next.
It was later identified as DNA.
Transformation experiment was first performed on which bacteria?
E.coli
Diplococcus pneumoniae
Salmonella typhi
Pasteurella pestis
From his transformation experiment Griffith concluded with transforming principle might be?
DNA
Polysaccharide Capsule
RNA
None
From his transformation experiment Griffith concluded with transforming principle might be?
DNA
Polysaccharide Capsule
RNA
None
