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Questions and Answers
Which of the following is a characteristic of Streptococci?
Which of the following is a characteristic of Streptococci?
- Motile with spore formation
- Gas production in cultures
- Catalase positive (correct)
- Gram-negative spherical shape
What is the typical arrangement of Streptococci?
What is the typical arrangement of Streptococci?
- Irregular groups
- Clusters
- Pairs
- Chains (correct)
What is the size range of Streptococci?
What is the size range of Streptococci?
- 0.1-0.5 um in diameter
- 2-5 um in diameter
- 0.5-2.0 um in diameter (correct)
- 3-8 um in diameter
What is the growth characteristic of Streptococci on BAP (Blood Agar Plate)?
What is the growth characteristic of Streptococci on BAP (Blood Agar Plate)?
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Which type of anaerobe are Peptostreptococci?
Which type of anaerobe are Peptostreptococci?
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Study Notes
Characteristics of Streptococci
- Gram-positive bacteria characterized by their spherical shape and tendency to form chains or pairs.
- Non-motile and do not produce spores.
Typical Arrangement
- Streptococci typically arrange themselves in chains or pairs, differentiating them from other bacterial formations.
Size Range
- Streptococci have a size range of approximately 0.5 to 1.0 micrometers in diameter, making them relatively small bacteria.
Growth on Blood Agar Plate (BAP)
- Streptococci exhibit different hemolytic patterns on Blood Agar Plates, indicating their ability to lyse red blood cells. They can display alpha (partial), beta (complete), or gamma (non-hemolytic) hemolysis.
Type of Anaerobe in Peptostreptococci
- Peptostreptococci are classified as anaerobic bacteria, specifically obligate anaerobes, meaning they thrive in environments devoid of oxygen.
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Description
Test your knowledge of the general characteristics and biochemical tests of streptococci, a common Gram-positive bacteria found in normal flora but can cause life-threatening infections when accessing sterile sites.
