CGCC Mortuary Science Microbiology Exam Practice 2026

Aerobes are types of bacteria that require oxygen for their growth and survival. These microorganisms utilize oxygen as a terminal electron acceptor in respiration, which allows them to metabolize nutrients more efficiently and produce energy through aerobic respiration. As a result, aerobes thrive in environments where oxygen is abundant.

In contrast, obligate anaerobes cannot survive in the presence of oxygen; they are harmed or killed by it. Facultative anaerobes can function with or without oxygen but prefer aerobic conditions if they are available. Microaerophiles require reduced levels of oxygen compared to what is present in the atmosphere and thrive in environments with low oxygen concentrations. Thus, the defining characteristic of aerobes is their necessity for high levels of oxygen, making this the correct answer.