1. With respect to oxygen requirements, an aerobe can use gaseous oxygen and possesses enzymes to process toxic oxygen products.
Proteins called enzymes aid in accelerating our bodies' chemical reactions, or metabolism. Some compounds are created, while others are broken down. Enzymes are a component of all life. Enzymes are created by our bodies spontaneously.
2. Expanding on this classification, an obligate aerobe cannot grow without oxygen.
3. Still other organisms, called facultative anaerobes, metabolize by aerobic respiration but can adapt to anaerobic environments.
A facultative anaerobic organism is one that can switch from aerobic respiration to fermentation in the presence of oxygen to produce ATP.
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