BIO 309D S08 Lec4 - Harvesting Energy Cells get energy from...

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Harvesting Energy Cells get energy from the food we eat Extract energy stored in food molecules to make ATP that the cell can use to do work Aerobic energy harvesting - dependent on oxygen Anaerobic energy harvesting
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O 2 H 2 O electron carriers Electron transport chain 4 CO 2 C Citric Acid cycle C 2 acetyl CoA C 2 ATP 32 or 34 ATP Transition reaction (mitochondrion) 2 CO 2 C C C C C C C glucose Glycolysis (cytoplasm) C C C 2 pyruvate C C C lactate 2 C C + C ATP 2 NAD+ regeneration 2
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Aerobic Energy Harvesting Requires O2 Cellular respiration
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Cellular Respiration Complete breakdown of glucose • C 6 H 12 O 6 +6 O 2 --> 6 H 2 O + 6 CO 2 + Energy Four phases: Glycolysis - inside cytoplasm Transition reaction- in mitochondria Citric acid cycle - in mitochondria Electron transport chain - in mitochondria
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glycolysis occurs in cytoplasm splitting of sugar glucose (6C) --> 2 pyruvate (3C) 2 ADP --> 2 ATP (net = profit) 2 NAD + --> 2 NADH *** produces small amount of energy (2 ATPs)***
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10 steps in 2 phases 1st step - energy investment phase - use up 2 ATPs and break them down into ADPs 2nd phase - make energy, take 2 ATPs and turn them into 2 NAD+ and 2 NADH -- take a hydrogen from glucose and stick it on to NAD
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Transition reaction occurs in mitochondrial matrix 2 pyruvate (3C ) --> 2 Acetyl CoA (2C) + 2 CO 2 2 NAD + --> 2 NADH
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loose a carbon in carbon dioxide CoA attaches on to carbons
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Citric Acid Cycle occurs in mitocondrial matrix • 2 Acetyl CoA (2C) --> 4 CO 2 6 NAD + --> 6 NADH • 2 FAD --> 2 FADH 2 2 ADP --> 2 ATP
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Electron transport chain occurs in inner mitochondrial membrane NADH + FADH 2 + O 2 --> H 2 O + NAD+ + FAD 32-34 ADP --> 32-34 ATP Use NADH and FADH2 Produce large amount og ATP Use O2 Make H2O
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36 ATP per glucose The entire Cellular Respiration process: produces 36 ATP per glucose
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Anaerobic Energy Harvesting Does not require O 2 Fermentation
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This note was uploaded on 03/25/2008 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas at Austin.

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BIO 309D S08 Lec4 - Harvesting Energy Cells get energy from...

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