An obligate aerobe is an organism that requires oxygen to grow.[1] Through cellular respiration, these organisms use oxygen to metabolise substances, like sugars or fats, to obtain energy.[1][2] In this type of respiration, oxygen serves as the terminal electron acceptor for the electron transport chain.[1] Aerobic respiration has the advantage of yielding more energy (adenosine triphosphate or ATP) than fermentation or anaerobic respiration,[3] but obligate aerobes are subject to high levels of oxidative stress.[2]
Group | Environment | O2 Effect | |
---|---|---|---|
Aerobic | Anaerobic | ||
Obligate Aerobe | Growth | No growth | Required (used for aerobic respiration) |
Obligate Anaerobe | No growth | Growth | Toxic |
Facultative Anaerobe (Facultative Aerobe) | Growth | Growth | Not required for growth but used when available |
Microaerophile | Growth if level is not too high | No growth | Required but at levels below 0.2 atm |
Aerotolerant Anaerobe | Growth | Growth | Not required and not used |
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