Cellular Energy Contents1 Glycolysis2 Fermentation3 Mitochondria4 Aerobic Respiration Glycolysis Fermentation Mitochondria Aerobic Respiration Cellular Respiration. Left side is glycolysis (anaerobic). The Right side is what occurs in the presence of oxygen in eukaryotes. The aerobic reactions occur inside the mitochondria after being fed AcetylCoA molecules from the cytoplasmic preparatory reaction.Closeup of the Elecron Transport Chain (ETC) that takes place on the inner membrane of mitochondria. This is where oxygen is utilized as the final electron acceptor. Reduction of 1/2 O2 results in the generation of a water molecule (chemiosmosis). Pages: 1 2