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In the complete oxidation of glucose, six CO2 molecules are formed per glucose molecule. The number of CO2 molecules released by glycolysis is _______, by pyruvate oxidation is _______, and by the citric acid cycle is _______. zero; two; four one; one; four one; two; three zero; zero; six two; two; two

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Answer:

zero, two, four.

Explanation:

In process of glycolysis no carbon dioxide (CO2) molecule is formed. From image 1 it can be seen that although no carbon dioxide is produced but two pyruvate molecules are formed.  Each pyruvate when oxidizes release one CO2 molecule as shown in image 2. Since we have two pyruvate molecules hence two carbon dioxide molecules are released. Double pyruvate oxidization results in two acetyl CoA, the citric acid cycle (Krebs cycle) then breaks down both acetyl CoA and releases four CO2 molecules.

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