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GLYCOLYSIS Takes place in the cytoplasm of the cell and is common to both aerobic and anaerobic respiration. glycolysis means literally that glucose is split and the 6 carbon glucose molecule is broken down to 2 X 3carbon molecules of Pyruvic acid. This produces a net gain of 2 ATP molecules. If oxygen is absent (anaerobic) in animal cells, such as muscle, 3C Pyruvic acid is converted to lactic acid. In plant cells, such as yeast, pyruvic acid is converted to 2C Ethanol + CO2 (fermentation) In both of the above only 2 ATP molecules are produced per glucose molecule respired. If oxygen is present (aerobic), pyruvic acid enters the mitochondrion to the fluid matrix where Kreb's cycle stages occur. During Kreb's cycle Citric acid is initially formed and is then broken down in a series of enzyme controlled rections releasing CO2 (waste product) and hydrogen. Hydrogen is picked up by a hydrogen carrier molecule called NAD and transported to the hydrogen carrier sytem (Cytochrome sytem) on the cristae of the mitochondrion for the final stage of respiration. Cytochrome system. Hydrogen is passed along a chain of hydrogen carrier molecules by a series of oxidation and reduction reactions. each time a hydrogen molecule is passed along, a molecule of ATP is produced from ADP and phosphate. The final Hydrogen acceptor is oxygen and produces a molecule of water (the other waste product). In all, 36 ATP molecules are generated during the Cytochrome system, making a total of 38 ATP (36 from cytochrome system + 2 ATP from glycolysis) produced when Glucose is respired aerobically. This makes aerobic respiration 19X more efficient at producing ATP than anaerobic respiration. Hope this helps!
Glycolysis is not a stage of aerobic respiration. It is glycolysis and is the first step for many things; fermentation, aerobic and anaerobic respiration, and all the sub categories as well.