Which processes are required for the complete oxidation of glucose?

Which processes are required for the complete oxidation of glucose?

• A. Glycolysis
• B. Pyruvate oxidation
• C. Citric acid cycle
• D. All of the choices are correct

Answer: (D)

Glucose is fully oxidized through a sequence of steps in cellular respiration, each removing electrons and carving carbon as CO2. Glycolysis happens in the cytosol and breaks glucose into two pyruvate molecules, yielding a small amount of ATP and NADH to start the process. Pyruvate oxidation then converts those pyruvate molecules into acetyl-CoA, releasing CO2 and generating NADH to feed the next stage. The citric acid cycle uses acetyl-CoA to further oxidize carbons, producing more NADH and FADH2 and releasing additional CO2. Those electron carriers power the electron transport chain, where most ATP is made and oxygen acts as the final electron acceptor, completing the oxidation of the carbon atoms to CO2 and water. Because each step is required to progress toward complete oxidation, all of these processes are needed.

Glucose is fully oxidized through a sequence of steps in cellular respiration, each removing electrons and carving carbon as CO2. Glycolysis happens in the cytosol and breaks glucose into two pyruvate molecules, yielding a small amount of ATP and NADH to start the process. Pyruvate oxidation then converts those pyruvate molecules into acetyl-CoA, releasing CO2 and generating NADH to feed the next stage. The citric acid cycle uses acetyl-CoA to further oxidize carbons, producing more NADH and FADH2 and releasing additional CO2. Those electron carriers power the electron transport chain, where most ATP is made and oxygen acts as the final electron acceptor, completing the oxidation of the carbon atoms to CO2 and water. Because each step is required to progress toward complete oxidation, all of these processes are needed.