What is the primary reason for the difference in energy yield between aerobic and anaerobic cellular respiration?

Core Concept

The primary reason for the difference in energy yield between aerobic and anaerobic cellular respiration is the presence of oxygen. Aerobic respiration, which occurs in the presence of oxygen, can produce significantly more ATP than anaerobic respiration, which occurs in the absence of oxygen. This is because aerobic respiration can use the energy from the transfer of electrons to produce a greater number of ATP molecules.