Microorganisms possessing metabolic pathways that can function in the presence or absence of oxygen are described as

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Facultative anaerobes are microorganisms that can switch between aerobic respiration and anaerobic respiration or fermentation based on the presence or absence of oxygen. They possess metabolic pathways that can function in both conditions. Obligate anaerobes can only survive in the absence of oxygen and cannot perform aerobic respiration. Anabolic respirers and catabolic anaerobes are not commonly used terms in microbiology.

Microorganisms Possessing Metabolic Pathways That Can Function in the Presence