In which process co2, is released as a by-product of oxidation-reduction reactions?

a) glycolysis
b) krebs cycle (citric acid cycle)
c) calvin cycle (light-independent reactions of photosynthesis)
d) light-dependent reactions of photosynthesis
e) chemiosmosis

B) Krebs cycle (citric acid cycle)

Explanation:

Glycolysis breaks glucose into two pyruvate molecules. Pyruvate is decarboxylated into acetyl CoA and the reaction occurs in the matrix of mitochondria. In the mitochondrial matrix, acetyl CoA enters Kreb's cycle and is broken down into CO2 and H2O. For one molecule of acetyl CoA, two molecules of CO2 are released as a by-product. Therefore, out of three carbon atoms of pyruvate, two are released as CO2 during Kreb's cycle.

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explanation:

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