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chap 9 cnotes3 - Chapter 9 Cellular Respiration Harvesting...

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Concept 9.3 -- The citric acid cycle completes the energy-yielding oxidation of organic molecules. Define Acetyl CoA (Upon entering the mitochondrion via active transport, pyruvate is first converted to a compound called acetyl coenzyme A) Three reactions: the junction between glycolysis and the citric acid cycle, is accomplished by a multienzyme complex that catalyzes three reactions. The citric acid cycle is also called the tricarboxylic acid cycle or the Krebs cycle The entry compound for the citric acid cycle in cellular respiration, formed from a fragment of pyruvate attached to a coenzyme. (Acetyl CoA) (1) Pyruvate′s carboxyl group (—COO ), which is already fully oxidized and thus has little chemical energy, is removed and given off as a molecule of CO 2 . (This is the first step in which CO 2 is released during respiration.) (2) The remaining two–carbon fragment is oxidized, forming a compound named acetate (the ionized form of acetic acid). An enzyme transfers the extracted electrons to NAD + , storing
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