IntroductionAll living organisms need energy. In order to obtain energy, the cells of organisms must go through processes of cellular respiration and/or fermentation. How “glucose oxidation leads to ATP production” is highlighted in cellular respiration (Freeman et al., 2014). Three steps can explain cellular respiration: glycolysis, the TCA cycle (or citric acid cycle or Krebs cycle) and oxidative phosphorylation. Glycolysis is divided into two different stages: energy investment and energy return on investment. During glycolysis, “ATP is both required and released at different stages” (Jordan & North 2013). The result is a net gain of two ATP, two NADH and the production of two pyruvates. This process takes place in the cytoplasm. The pyruvates then cross the plasma membrane and enter the mitochondrial matrix. During this pyruvate treatment, NADH and CO2 are released and pyruvates are converted to acetyl CoA. Acetyl CoA then passes through the TCA cycle, producing ATP, NADH, FADH2 and CO2. Finally, NADH and FADH2 pass through the electron transport chain....