12903874-Option-Cell-Respiration-2

12903874-Option-Cell-Respiration-2 - Cell respiration 3...

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Unformatted text preview: Cell respiration 3 Cell respiration 3 Explain aerobic respiration, including the link Explain aerobic respiration, including the link reaction, the Krebs cycle, the role of NADH+H reaction, the Krebs cycle, the role of NADH+H + + , the , the electron transport chain and the role of oxygen. electron transport chain and the role of oxygen. Explain oxidative phosphorylation in terms of Explain oxidative phosphorylation in terms of chemiosmosis. chemiosmosis. Explain the relationship between the structure of Explain the relationship between the structure of the mitochondrion and its function. the mitochondrion and its function. Analyse data relating to respiration. Analyse data relating to respiration. Aerobic respiration Aerobic respiration To anaerobic organisms oxygen is toxic. To survive in an oxygen-rich environment, anaerobes had to evolve a means of disposing of this deadly gas. Aerobic respiration (respiration with oxygen) is thought to have evolved as a means of getting rid of oxygen. Aerobic respiration is often summarized by the equation: C 6 H 12 O 6 +6O 2 6CO 2 +6H 2 O glucose + oxygen carbon dioxide + water The equation implies that glucose is broken down in a single step, but this is a gross simplification. If glucose is oxidised in this way outside the cell, it burns and creates a flame. Cells have to oxidise glucose in a much more controlled manner so that the heat generated does not destroy them. There are three major stages in aerobic respiration: glycolysis, the Krebs cycle and the electron transport system (a chain of electron acceptors - proteins). Krebs cycle pyruvate to acetyl-CoA Krebs cycle pyruvate to acetyl-CoA The Krebs cycle The Krebs cycle is the central phase of the aerobic respiration of glucose. If oxygen is available, the three-carbon pyruvate formed at the end of glycolysis is converted into...
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12903874-Option-Cell-Respiration-2 - Cell respiration 3...

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