BSC 2010C Chapter Notes - Chapter 9: Electron Transport Chain, Net Energy Gain, Energy Harvesting
Document Summary
With adequate o2 supplies food is burnt (aerobic respiration) In absence of o2 food molecules are fermented . Synthesis or build up is anabolic (build bonds) Cell respiration stores energy in atp molecules. C6h12o6 + 6o2 ----> 6co2 + 6h2o + energy. Energy is used for body maintenance and voluntary activity. Energy obtained by transferring electrons (hydrogens) from organic molecules to oxygen. Involves series of steps coupling endergonic and exergonic reactions. Paired endergonic-exergonic reactions are known as redox (reduction-oxidation) reactions. Breakdown of glucose involves series of redox reactions. At each step breakdown portion oxidized and nad+ reduced to nadh. Energy released when electrons fall from hydrogen carrier to oxygen. Series of redox reactions, passes electrons from one molecule to next. Small amounts of energy released to make atp. Uses potential energy of h+ gradient produced by electron transport chain to generate atp. Does not involve either electron transport chain or atp synthase.
