Lecture _8 - Respiration - Glycolysis and The Citric Acid Cycle

Lecture _8 - Respiration - Glycolysis and The Citric Acid Cycle

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espiration: lycolysis nd Respiration: Glycolysis and the Citric Acid Cycle Campbell Reece, Eighth Edition eading Assignment: verall equation gives the impression that it occurs Reading Assignment: Chapters 9 BIOL 203 – Overall equation gives the impression that it occurs in a single step. However, aerobic respiration takes place in about 20 steps, grouped into four stages: Spring 2010 Ralph Feuer 1) Glycolysis 2) Formation of acetyl conenzyme A 3) The citric acid cycle (Krebs cycle) 4) The electron transport chain and chemiosmosis
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Overview: Life Is Work Living cells require energy rom outside sources from outside sources Some animals, such as the giant panda, obtain energy by eating plants Some animals feed on other organisms that eat plants
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Energy Flows Energy flows into an ecosystem as sunlight Leaves as heat Photosynthesis generates O 2 and organic molecules, Used in cellular respiration Cells use chemical energy stored in organic molecules Regenerate ATP Powers work
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Energy Flows Energy flows into an ecosystem s unlight Light energy as sunlight Leaves as heat ECOSYSTEM hotosynthesis Photosynthesis generates O 2 and organic molecules, Used in cellular respiration Photosynthesis in chloroplasts CO 2 + H 2 O Cellular respiration in mitochondria Organic molecules + O 2 Cells use chemical energy stored organic molecules in organic molecules Regenerate ATP Powers work ATP powers most cellular work Heat nergy ATP energy
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Catabolic Pathways Yield Energy By xidizing Organic Fuels Oxidizing Organic Fuels Several processes are central to cellular respiration and related pathways Catabolic Pathways and roduction of ATP Production of ATP The breakdown of organic molecules is exergonic ermentation is a partial Fermentation is a partial degradation of sugars that occurs without O2 Aerobic respiration consumes organic molecules and O 2 and yields ATP Anaerobic respiration is similar to aerobic respiration p but consumes compounds other than O 2
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Cellular Respiration I ncludes both aerobic and anaerobic respiration Often used to refer to aerobic respiration 2 NADH 2 NADH 6 NADH 2 FADH 2 2 FADH 2 2 NADH CYTOSOL Electron shuttles span membrane or MITOCHONDRION Although carbohydrates, fats, and proteins are all Oxidative phosphorylation: electron transport and chemiosmosis Citric acid cycle 2 Acetyl CoA Glycolysis Glucose 2 Pyruvate consumed as fuel Helpful to trace cellular respiration with the Maximum per glucose: About 36 or 38 ATP + 2 ATP + 2 ATP + about 32 or 34 ATP sugar glucose: C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + Energy (ATP + heat)
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Redox Reactions: Oxidation and Reduction The transfer of electrons during chemical reactions Releases energy stored in organic olecules molecules This released energy is ultimately used to synthesize ATP becomes oxidized (loses electron) The Principle of Redox Chemical reactions that transfer electrons between reactants are called becomes reduced
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This note was uploaded on 03/07/2010 for the course BIO 203 taught by Professor Feuer during the Spring '10 term at San Diego State.

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Lecture _8 - Respiration - Glycolysis and The Citric Acid Cycle

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