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Questions and Answers
What is the main classification basis for Streptococci?
What is the main classification basis for Streptococci?
- Gram staining, Motility, and Capsule formation
- Enzyme production, Toxin secretion, and Flagella presence
- Temperature tolerance, Spore formation, and Cell wall composition
- Oxygen requirement, Hemolysis, and Antigenic structure (correct)
Which site is notably inhabited by Streptococci as commensals?
Which site is notably inhabited by Streptococci as commensals?
- Skin surface
- Gastrointestinal tract
- Genitourinary tract
- Upper respiratory tract (correct)
What type of media is required for the culture of most Streptococci?
What type of media is required for the culture of most Streptococci?
- Enriched media like blood agar (correct)
- Selective media like MacConkey agar
- Differential media like Eosin Methylene Blue agar
- Nutrient agar without any additives
At what temperature does S. faecalis grow, unlike most Streptococci?
At what temperature does S. faecalis grow, unlike most Streptococci?
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What is present in the cell wall of Streptococci?
What is present in the cell wall of Streptococci?
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Study Notes
Streptococci Classification and Characteristics
- The main classification basis for Streptococci is based on hemolytic activity, which includes alpha-hemolytic, beta-hemolytic, and gamma-hemolytic (non-hemolytic) species.
- Streptococci are commensals and can be found in the human throat, skin, and gut.
Culture and Growth Requirements
- Most Streptococci require enriched media, such as blood agar, for culture.
- S. faecalis grows at 45°C, unlike most Streptococci which typically grow at 37°C.
Cell Wall Composition
- The cell wall of Streptococci contains teichoic acid.
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