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The below mentioned article provides a quick note on the Respiration in Bacteria.
According to the mode of respiration, bacteria can be aerobic or anaerobic. Each of them is further of two types, obligate and facultative.
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Aerobic:
(a) Obligate Aerobes:
They are bacteria which can respire only aerobically. They generally get killed under anaerobic conditions, e.g., Bacillus subtilis.
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(b) Facultative Aerobes:
They are bacteria which respire an aerobically under normal conditions but can respire aerobically when oxygen is available. Most of the photosynthetic bacteria (e.g., Rhodopseudomonas) belong to this group.
Anaerobic:
(a) Facultative Anaerobes:
They are bacteria which generally respire aerobically but switch over to anaerobic mode of respiration if oxygen becomes deficient, e.g., halophiles.
(b) Obligate Anaerobes:
The bacteria of this category respire only an aerobically. They generally get killed under aerobic conditions, e.g., Clostridium botulinum.
