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Griffith's Experiment

The main reas...

Question

The main reason for the virulent nature of the S strain of Streptococcus pneumoniae is the presence of:

A

Polysaccharide capsule

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B

Lipoprotein cell membrane

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C

Mesosome

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D

Pili on cell envelope

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Solution

The correct option is A
Polysaccharide capsule

Each of the S strain bacteria of Streptococcus pneumoniae has a surrounding polysaccharide capsule which protects them from being attacked by the host organism’s immune system. This helps these bacteria cause the disease in the host.

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Similar questions

Q. Short / Long answer type questions.
What functions are associated with the following cell structures ? capsule, cell wall, cytoplasmic membrane, nucleus, mesosome, spore, flagellum and pili.

Q. Which of the following statements are true regarding Griffith’s experiment?
I. Biochemical nature of genetic material was known
II. Experimental bacteria were Streptococcus pneumoniae
III. Heat killed virulent bacteria was transformed
IV. S-strain is virulent as it lacks a capsule

Q. Frederick Griffith accidentally discovered transformation when attempting to
develop a vaccine for pneumonia. He injected mice with samples from S strain
(virulent) and/or R strain (non-virulent) pneumococcal bacteria (Streptococcus
pneumoniae). Which of the following results is NOT consistent with Griffith's
experiments?

Q. Which of the following statements are true regarding Griffith’s Experiment?
I. Biochemical nature of genetic material is known.
II. Experimental bacteria is Streptococcus
III. Heat killed virulent bacteria is transformed.
IV. S strain is virulent as it lacks capsule

Q. To describe transforming principle, Frederick Griffith performed series of experiments by selecting two strains of Streptococcus pneumoniae namely S-strain (virulent) and R-strain (non-virulent).
Which of the following steps does not describe this experiment?
[0.7 mark]

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