Oxidative Phosphorylation is the metabolic process needed to provide energy for the cell. It is the final stage in the process of cellular respiration, where acetyl CoA produce energy precursors that leads to the phosphorylation of ADP, producing adenosine triphosphate (ATP) and in return provide energy. Moreover, when the body lacks oxygen, fermentation happens. During glycolysis, only two ATP molecules are produce and the pyruvate is reduce to NADH forming lactate. Meanwhile, in alcoholic fermentation pyruvate is converted to ethanol, releasing CO2. Lastly, the co-enzyme that is involved in photosynthesis is NADP+ where extra phosphate group is attached.