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Aerobic bacteria require oxygen for cellular respiration, while anaerobic bacteria do not require oxygen and cannot grow in the presence of it. They produce energy through fermentation. They are similar in the the fact they can share nutritional requirements.
In the presence of oxygen, facultative anaerobes use aerobic respiration; without oxygen some of them ferment, some use anaerobic respiration. Some examples of facultative anaerobic bacteria are the Staphylococci (Gram positive), Escherichia coli (Gram negative), Corynebacterium (Gram positive), and Listeria (Gram positive). Organisms in the Kingdom Fungi can also be facultative anaerobic, such as yeasts. Word origin: an- from Gk., not, without, + Greek Äero-, from ÄÄr, air. Compare: obligate anaerobe. See also: facultative anaerobe, microaerophile, aerotolerant.