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The Krebs Cycle and the Electron Transport Chain

The Krebs Cycle and the Electron Transport Chain. Chapter 9-2 Pg 226-231. Stage One—Glycolysis. Glycolysis —process in which one molecule of glucose is broken in half, producing two molecules of pyruvic acid, a 3-carbon compound Input: one glucose molecule and 2 ATP

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The Krebs Cycle and the Electron Transport Chain

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  1. The Krebs Cycle and the Electron Transport Chain Chapter 9-2 Pg 226-231

  2. Stage One—Glycolysis • Glycolysis—process in which one molecule of glucose is broken in half, producing two molecules of pyruvic acid, a 3-carbon compound • Input: one glucose molecule and 2 ATP • Output: 4 ATP and 2 pyruvic acid • Net gain of 2 ATP • With the presence of oxygen cellular respiration begins.

  3. Stage Two—The Krebs Cycle • The Krebs cycle—pyruvic acid (from glycolysis) is broken down into carbon dioxide in a series of energy-extracting reactions. • Takes place in the mitochondria • Citric acid is the first compound formed in this series of reactions. • Also known as the citric acid cycle.

  4. Krebs Cycle continued • 6 molecules of ATP are produced • Other products are high-energy electrons used in the next step • Carbons are extracted from the glucose and are used to form carbon dioxide. • Video

  5. Stage Three—The Electron Transport Chain • Electron transport chain—uses the high-energy electrons from the Krebs cycle to convert ADP into ATP • Totals from a single molecule of glucose: 36 molecules of ATP • If there is no oxygen, the process ends following glycolysis —2 ATP • Video • Overview Video

  6. Picture Credits • http://student.ccbcmd.edu/~gkaiser/biotutorials/energy/images/chemios_il.jpg • http://ncam.wgbh.org/publications/stemdx/images/krebs.jpg

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