The common aerobic respiration consists of three steps glycolysis, Krebs’ cycle and terminal oxidation. Glycolysis is the process of breakdown of glucose or similar hexose sugar to two molecules of pyruvic acid through a series of enzyme mediated reactions (occurs in cytosol) releasing some energy (as ATP) and reducing power (as NADH2). It is common to both plant and animal cells and to both aerobic and anaerobic modes of respiration