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SFR 100 – Topic #9 : Respiration Topic #9 Respiration. (Campbell and Reece 163-183) I. II. Objectives A. Understand basic process for recovering energy from sugar and other organic molecules. B. Relate material to previous topics. Introduction. A. Cellular respiration (aerobic respiration) B. Cellular metabolism. C. Redox. D. NADH is an electron carrier page 1 SFR 100 – Topic #9 : Respiration III. page Glycolysis (Stage I of Respiration). A. Reaction summaries: 1. Glucose + 2 ATP + enzymes 2 G3P + 2 ADP (glyceraldehyde-3-phosphate) B. 2. 2 G3P + 2 NAD+ + 2 ADP + enzymes 2 PGA + 2 NADH + 2H+ + 2 ATP (phosphoglycerate) 3. 2 PGA + 2 ADP + enzymes pyruvate + 2 ATP + 2H2O Glucose= C6H12O6 oxidized to pyruvate=C3H303- IV. Fermentation. V. Aerobic respiration in mitochondria. A. Mitochondria. 2 SFR 100 – Topic #9 : Respiration B. Stage II. 1. Pyruvic acid oxidized to produce 2CO2 and 2 NADH plus acetyl-CoA. C. Stage III - Krebs cycle or citric acid cycle. D. Stage IV. 1. E. page 6O2 + 10 NADH (20 e- 10 H+) + 10H+ + 2FADH2 (4 e- 4 H+) + 32ADP + 32PO4 12H2O (24 e- 24 H+) + 2 NAD+ 32 ATP Final accounting. 3 SFR 100 – Topic #9 : Respiration VI. Other sources of energy. A. Fats. 1. Hydrolysis. 2. P3G and acetyl-CoA produced. 3. More hydrogen, more energy. a) B. Oxidative phosphorylation. b) Double the energy of carbohydrates. Proteins. 1. Amino group removed to form ammonia. 2. VII. page Products fed into respiration pathways. Key Terms. aerobic respiration anaerobic respiration metabolism anabolism catabolism anaerobic metabolism aerobic metabolism glycolysis substrate-level phosphorylation P3G NADH pyruvic acid fermentation lactic acid ethyl alcohol acetyl-CoA Krebs citric acid cycle FADH respiratory electrontransport chain oxidative phosphorylation chemiosmosis 4