What Is the Final Electron Acceptor in Aerobic Respiration?

According to McGraw Hill Education, oxygen serves as the last electron acceptor throughout the process of aerobic respiration. Pyruvate, a different molecule than oxygen, serves as the ultimate electron acceptor in the process of anaerobic respiration. During the course of cellular metabolism, both of these activities take place.

The electron acceptors that chemotrophic microorganisms use and the energy sources that they draw from are both variable. Fermentation is the process that takes place when an organic energy source is broken down and oxidised without the participation of an exogenous electron acceptor. Respiration is the term used to describe the process that takes place when the energy source is broken down and oxidised without the participation of an electronic acceptor. Depending on the source of the ultimate electron acceptor, respiration may either be aerobic or anaerobic.