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Problems Associated With Aerobic Life 1. Organisms living in oxygen-rich environments produce (unintentionally) oxidizing compounds from O2: O2- (oxygen radicals) H2O2 (hydrogen peroxide) 2. Oxidizing compounds are toxic to cellular components 3. Therefore, aerobes have several enzymes to destroy toxic oxygen derivatives. Superoxide Dismutase (SODS) O2- + O2- + 8H+ oxygen radicals 4H2O water Catalase (Peroxidase) 2H2O2 hydrogen peroxide 2H2O water + O2 oxygen gas The Catalase Test is used to identify bacteria which are aerobic or facultatively anaerobic. Bacteria + H2O2 bubbles