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Respiration Assessment
Member rating: No Rating | Words: | Submitted: Thu Jan 13 2005
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Cell Biology Respiration Assessment Cell Biology Respiration Assessment An Overview The anaerobic respiration of glucose has four distinct stages 1. Glycolysis 2. Pyruvate oxidation (the "link" reaction) 3. The Krebs Cycle 4. The Electron transport chain Glycolysis A glucose molecule is converted into 2 molecules of pyruvate, a 3-carbon compound. It does not require oxygen and produces 2 molecules of ATP. Glycolysis takes place in the cytosol, the fluid part of the cytoplasm. Overall, for each molecule of glucose, glycolysis produces: * 2 molecules of ATP (4 are created but 2 are used up in glycolysis) * 2 molecules of NADH (reduced coenzyme which later feeds electrons into the electron transport chain) * 2 molecules of pyruvate (which enters the "link" reaction if oxygen is available) Pyruvate Oxidation This is the reaction, which links glycolysis with the Krebs cycle. In the presence of oxygen, pyruvate moves from the cytosol to the mitochondrial matrix where it is oxidised into acetate (a 2c molecule), producing carbon dioxide as...
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