[Campbell Biology P.631] Which statement accurately differentiates between obligate aerobes,... | Practice Question
Which statement accurately differentiates between obligate aerobes, obligate anaerobes, and facultative anaerobes?
A: Obligate aerobes require O2; obligate anaerobes are poisoned by O2; facultative anaerobes use O2 if present but can function without it.
B: Obligate aerobes are poisoned by O2; obligate anaerobes require O2; facultative anaerobes only use O2.
C: Obligate aerobes can function without O2; obligate anaerobes require O2; facultative anaerobes are poisoned by O2.
D: All three types strictly require O2 for their metabolic processes.
Explanation
Obligate aerobes require O2 for cellular respiration. Obligate anaerobes are poisoned by O2. Facultative anaerobes can use O2 if present but can also carry out fermentation or anaerobic respiration in an anaerobic environment.