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Facultative aerobic bacteria / Facultative anaerobic organism

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Key feature: Facultative anaerobes can grow with or without oxygen because they can metabolize energy aerobically or anaerobically. They gather mostly at the top because aerobic respiration generates more ATP than fermentation

Facultative anaerobic bacteria are different from Obligate anaerobes. They may consume dietary carbohydrates. This can divert nutrients from the host. It might also produce harmful compounds.
Caffrey et al. 2024 Cell Metab 36: 684-701

Their important enzymes are: Superoxide Dismutases (SODs), catalase, [peroxidase](brain://U11ip2j_7kmDEV2iBd3R4g/Peroxid…