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Bacteria that reproduce best at 15-20 degrees C
Psychrophilic
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Bacteria that reproduce best at 20-45 degrees C
Mesophilic
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Bacteria that reproduce best at 50-55 degrees C
Thermophilic
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Organisms that reproduce in the presence of O2
Aerobes
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Organisms that grow only in the presence of free O2
Obligate aerobes
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Organisms that do not reproduce in the presence of O2
Anaerobes
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Organisms that grow only in the absence of free O2 & are killed if exposed to free O2
Obligate anaerobes
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Organisms that grow in the presence of free oxygen & in an O2-free atmosphere.
Facultative organisms
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Organisms that grow only in low amounts of free O2
Microaerophilic organisms
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Spherical, appears singly, in pairs, chains, clusters, or packets
Coccus (pl - cocci)
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Rod-shaped, appears singly, in chains, or in palisades
Bacillus (pl - bacilli)
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Spiral-, corkscrew-, or comma-shaped, appearing singly only
Spirillum (pl - spirilla)
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A gummy, gelatinous, or mucoid structure surrounding certain bacteria
capsule
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An inactive, resting, and resistant form produced within the organism, usually as a result of unfavorable environmental conditions.
Spore
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A hairlike structure that provides motility.
Flagellum
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Self-nourishing bacteria
Autotrophic bacteria
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Non self-sustaining bacteria
Heterotrophic bacteria
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