Podcast
Questions and Answers
Campylobacter spp is also a common cause of _______
Campylobacter spp is also a common cause of _______
diarrhea
Vibrio parahaemolyticus is the cause of _______
Vibrio parahaemolyticus is the cause of _______
diarrhea
Vibrio spp V.cholera is the cause of _______
Vibrio spp V.cholera is the cause of _______
cholera
Spirochetes are spiral/helical in shape, flexible, and have an axial _______
Spirochetes are spiral/helical in shape, flexible, and have an axial _______
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Treponema pallidum is the cause of _______
Treponema pallidum is the cause of _______
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Borrelia spp. are the causative agents of Lyme disease and _______ fever
Borrelia spp. are the causative agents of Lyme disease and _______ fever
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Bacteria in the genus Mycoplasma do not have _______
Bacteria in the genus Mycoplasma do not have _______
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Pleomorphism is the ability to exist in a variety of _______
Pleomorphism is the ability to exist in a variety of _______
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Study Notes
Bacterial Shapes
- Curved bacteria, also known as Sprilla, are typically comma-shaped and usually occur singly, but some species can form pairs, resembling a bird with a "gull wing" morphology.
- Examples of curved bacteria include Vibrio spp, such as V. cholera, which causes cholera, and V. parahaemolyticus, which causes diarrhea.
Spiral-shaped Bacteria (Spirochetes)
- Spiral-shaped bacteria, known as spirochetes, are characterized by their spiral or helical shape, flexibility, and axial filament, which aids in motility.
- The axial filament is a key feature that distinguishes spirochetes from other bacteria, and it helps in the twisting motion of the bacterium's motility.
- Different species of spirochetes vary in size, length, rigidity, and the number and amplitude of their coils.
Specific Examples of Spirochetes
- Treponema pallidum is a tightly coiled spirochete that causes syphilis, a sexually transmitted infection, and has a flexible cell wall that enables it to move readily through tissues.
- Borrelia spp. are less tightly coiled spirochetes that cause Lyme disease and relapsing fever.
Pleomorphic Bacteria
- Pleomorphic bacteria are those that can exist in a variety of shapes, a phenomenon known as pleomorphism.
- Some bacteria may lose their characteristic shape due to adverse growth conditions.
Cell Wall-less Bacteria
- Bacteria in the genus Mycoplasma lack cell walls.
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Description
Learn about the unique shapes of bacteria including curved and spiral, with examples like Vibrio cholerae and Campylobacter spp. Explore the characteristics of spirochetes and how their axial filament aids in motility.
