Respiration160-page9 - • 2 CO 2 given off(plus 1 from...

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Cell Respiration - 9 A closer Look at the Krebs Cycle Any cycle requires a substance to start the cycle (which will also be the end of the cycle). For the Krebs cycle the starter is oxaloacetic acid (oxaloacetate), a 4- carbon acid that is regenerated at the end of the cycle. The enzymes needed to do the Krebs cycle are located in the mitochondrial matrix. Acetyl-CoA combines with oxaloacetic acid to begin the cycle forming the 6- carbon citric acid (citrate). Co-A is released to pick up more acetyl. For each turn of the Krebs cycle we get:
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Unformatted text preview: • 2 CO 2 given off (plus 1 from pyruvate oxidation to acetyl) = 3 CO 2 • 1 ATP produced (by substrate phosphorylation) • 1 FADH 2 • 3 NADH (plus 1 from pyruvate oxidation to acetyl) = 4 NADH The Krebs Cycle – Specifics The Krebs cycle will turn two times for each glucose molecule. Two turns of the Krebs cycle (including the preparation step of pyruvate ± acetyl will produce: • 6 CO 2 • 2 ATP produced (by substrate phosphorylation) • 2 FADH 2 • 8 NADH...
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