CH 13 - Chapter 13 How cells obtain energy from food The...

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10/5/09 1 Chapter 13 How cells obtain energy from food The breakdown and oxidation of food occurs in three stages
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10/5/09 2 ? Glycolysis Conversion of glucose (6C) to two molecules of pyruvate (3C) 10 enzymatic steps (harvest energy in small steps) All steps occur in the cytosol ATP production: Requires an initial investment of two ATP Produce four ATP Net yield => two ATP No O 2 involved, but oxidations occur (NAD + NADH) Yields two NADH per glucose
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10/5/09 3 NADH and NADPH are electron carriers A + e - + H + AH Review chapter 3 13_03_glycolysis.jpg What’s wrong here?
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10/5/09 4 Glycolysis - Energy Investment Steps Glycolysis - cleavage from 6C to 3C
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10/5/09 5 Glycolysis - First energy producing steps These reactions are coupled to yield NADH and ATP Substrate-level phosphorylation Substrate-level phosphorylation Production of ATP by direct transfer of a high-energy phosphate group to ADP
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10/5/09 6 Substrate-level phosphorylation 13_07_Phosphate_bond.jpg
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