How is the metabolism of an obligate anaerobe different from the metabolism of a facultative anaerobe?
Obligate anaerobes can only use the citric acid cycle to produce free energy.
Obligate anaerobes can only use anaerobic respiration to produce free energy.
Obligate anaerobes can use both aerobic and anaerobic respiration to produce free energy.
Obligate anaerobes can only use catabolic pathways to build organic macromolecules.
The correct answer is: Obligate anaerobes can only use anaerobic respiration to produce free energy.
Obligate anaerobes cannot survive in the presence of oxygen and rely solely on anaerobic respiration for their energy needs. They typically use fermentation or other anaerobic pathways to generate ATP. In contrast, facultative anaerobes have the ability to switch between aerobic and anaerobic respiration depending on the availability of oxygen.