The different robes of microbiology

Strict (Obligate) Aerobes

Bacteria that require oxygen for growth and rely exclusively on aerobic respiration for energy production, as they cannot survive or grow without O₂.

Facultative Anaerobes

Bacteria that grow optimally with oxygen using aerobic respiration but can switch to fermentation or anaerobic respiration (using alternative electron acceptors) in its absence, allowing growth with or without O₂.

Aerotolerant Anaerobes

Bacteria that do not use oxygen for respiration and rely solely on fermentation for energy, BUT they can tolerate its presence and grow in environments with or without O₂.

Strict (obligate) Anaerobes

Bacteria that cannot tolerate oxygen, as it is toxic to them, and they grow only in oxygen-free environments using fermentation or anaerobic respiration