Lecture 15 - BIOL104-04 Principles of Biology I Lecture #15...

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BIOL104-04 Principles of Biology I Lecture #15 September 29, 2010 Ch 7 How Cells Harvest Energy
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Summary of Glycolysis Takes place in the cytoplasm 1 six-carbon glucose ! 2 three-carbon pyruvate Net yield of 2 ATP molecules Yield of 2 NADH molecules What happens to the pyruvate?
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Aerobic Respiration • Presence of oxygen • Extraction of additional energy from pyruvate • Where does it happen? – Eukaryotes – Prokaryotes
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Oxidation of Pyruvate Step 1 3-carbon Pyruvate ! 2-carbon compound + CO 2 Yields 2 NADH Step 2 2-carbon compound attached to Coenzyme A
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Krebs Cycle • Occurs in the matrix of the mitochondria • Acetyl Coenzyme A is oxidized • Series of nine reactions • For each two-carbon acetyl coA molecule 2 CO 2 molecules 1 ATP 3 NADH 1 FADH 2
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Glucose becomes CO 2 • Glucose is entirely consumed – 6 CO2 molecules – Energy • 4 ATP molecules • Reduced state of 12 electron carriers – 10 NADH – 2 FADH 2 • Now what do the electron carriers do?
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Lecture 15 - BIOL104-04 Principles of Biology I Lecture #15...

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