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REVIEW NOTES - Chapter 9 Cellular Respiration Energy flows...

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Chapter 9: Cellular Respiration Energy flows into an ecosystem as sunlight and leaves as heat. Three pathways of respiration: glycolosis, citric acid cycle, oxidative phosphorylation. Catabolic pathways yield energy by oxidizing organic fuels Catabolic Pathways and Production of ATP Fermentation: breaking down of sugars, (anaerobic) Cellular respiration: oxygen consumed with organic fuel, (aerobic) Food=fuel, exhaust=CO2 and H20 C6H12O6 + 6-O2 6-CO2 + 6-H20 + Energy (ATP + Heat) Breakdown of glucose = exergonic Free energy change (G = -686 kcal/mol) Can happen w/out input of energy (spontaneously) Oxidation and Reduction Oxidation – loss of electrons Reduction – gain of electron Energy must be added to pull an electron from an atom In cell. Resp., glucose oxidized, O2 reduced Organic molecules > H > excellent fuels > energy released as electrons transfer to O2 ETC and NAD+ H’s first go to NAD+ (oxidizing agent) (electron acceptor) Dehydrogenase enzyme – removes pair of H atoms (2e,2p) Delivers 2e,1p to NAD+ Sugar + NAD+ (Dehydrogenase)
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