An organism is discovered that thrives in both the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism ________.
A) must use a molecule other than oxygen to accept electrons from the electron transport chain
B) is a normal eukaryotic organism
C) is photosynthetic
D) is an anaerobic organism
E) is a facultative anaerobe

Question

Quizplus · Accepted Answer

Facultative anaerobes are able to switch between aerobic and anaerobic respiration depending on the availability of oxygen. They can still generate ATP through anaerobic respiration when oxygen levels are low or absent, but they prefer to use aerobic respiration in the presence of oxygen. The fact that the consumption of sugar increases when oxygen is removed suggests that this organism is using anaerobic respiration to generate ATP. However, it can also use aerobic respiration when oxygen is available.

An Organism Is Discovered That Thrives in Both the Presence