During which of the following metabolic processes is most of the CO₂ from the catabolism of glucose is released?
A) glycolysis
B) electron transport
C) oxidation of pyruvate to acetyl-CoA
D) the citric acid cycle

Question

Quizplus · Accepted Answer

The citric acid cycle (also known as the Krebs cycle) is where most of the carbon dioxide is released during the breakdown of glucose. This occurs as acetyl-CoA from the oxidation of pyruvate combines with oxaloacetate to form citrate, which is then broken down into carbon dioxide and other compounds. The carbon dioxide is released during steps involving decarboxylation, which removes a carbon atom in the form of carbon dioxide. In total, two carbons are released as carbon dioxide during each turn of the cycle.

During Which of the Following Metabolic Processes Is Most of the CO₂