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Questions and Answers
What kind of media is required for the growth of Streptococcaceae family members?
What kind of media is required for the growth of Streptococcaceae family members?
- Media enriched with salt and water
- Media enriched with sulfur and phosphorus
- Media enriched with glucose and starch
- Media enriched with blood, serum, or ascitic fluid (correct)
Which classification system divides streptococci into obligate anaerobes and aerobes or facultative anaerobes?
Which classification system divides streptococci into obligate anaerobes and aerobes or facultative anaerobes?
- Serological classification
- Cultural character-based classification (correct)
- Molecular classification
- Morphological classification
What are streptococci classified as based on their hemolytic property on blood agar plates?
What are streptococci classified as based on their hemolytic property on blood agar plates?
- Obligate aerobes
- Aerobic or facultative anaerobic streptococci (correct)
- Gram-negative rods
- Facultative anaerobes
Why is morphological classification of streptococci not considered satisfactory?
Why is morphological classification of streptococci not considered satisfactory?
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How are long-chain streptococci typically classified?
How are long-chain streptococci typically classified?
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Study Notes
General Characters of Streptococci
- Belong to the Streptococcaceae family
- Gram-positive cocci arranged in chains
- Non-motile and non-sporing
Growth Requirements
- Fastidious microorganisms
- Require media enriched with:
- Blood
- Serum
- Ascitic fluid for growth
Classification of Streptococcus
Morphological Classification
- Classified into:
- Long chain (pathogenic strain)
- Short chain (non-pathogenic)
- Not a satisfactory method due to:
- Chain length dependent on growth medium
- Other factors influencing chain length
Classification based on Cultural Characteristics
- Divided into:
- Obligate anaerobes (Peptostreptococci)
- Aerobes or facultative anaerobes
- Aerobic or facultative streptococci further classified based on:
- Hemolytic property on blood agar plate
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Description
This lecture covers the general characteristics and classification of Streptococcus, a type of Gram-positive cocci. It includes their growth requirements and different systems of classification.
