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• Oxidation of two carbons to give CO 2 and transfer<br />
of energy to reduced coenzymes occurs in the<br />
citric acid cycle, also known as the tricarboxylic<br />
acid cycle (TCA) or Krebs cycle (after Hans Krebs,<br />
who unraveled its complexities in 1937).<br />
► <strong>The</strong> citric acid cycle is a closed<br />
loop of reactions in which the<br />
product of the final step which has<br />
four carbon atoms, is the reactant<br />
in the first step.<br />
Copyright © 2010 Pearson<br />
Education, Inc.<br />
Chapter Twenty One 2
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