Which process yields the most ATP from the oxidation of molecules?

Which process yields the most ATP from the oxidation of molecules?

• A. Complete oxidation of 4 molecules of glucose
• B. Complete oxidation of 8 molecules of acetyl CoA
• C. Complete oxidation of 8 molecules of pyruvate
• D. All of the above

Answer: (A)

The process that yields the most ATP from the oxidation of molecules is the complete oxidation of glucose. When considering the complete oxidation of glucose, it is important to note that one molecule of glucose can generate a significant amount of ATP through cellular respiration. This includes glycolysis, the citric acid cycle, and oxidative phosphorylation. In the case of complete oxidation of 4 molecules of glucose, the total theoretical yield can be around 36 to 38 ATP per glucose molecule, depending on the efficiency of the electron transport chain and how the protons are transferred across the mitochondrial membrane. Therefore, for 4 molecules, this would result in roughly 144 to 152 ATP. On the other hand, while acetyl CoA and pyruvate can also lead to ATP production, they enter the citric acid cycle at different points and yield less ATP overall compared to the complete oxidation of glucose. Acetyl CoA is derived from glucose and other substrates, and pyruvate can also yield energy, but on a per molecule basis, they do not compare favorably to glucose in terms of total ATP yield from complete oxidation. Thus, the complete oxidation of a larger number of glucose molecules leads to a higher total yield of ATP, making this option the most

The process that yields the most ATP from the oxidation of molecules is the complete oxidation of glucose. When considering the complete oxidation of glucose, it is important to note that one molecule of glucose can generate a significant amount of ATP through cellular respiration. This includes glycolysis, the citric acid cycle, and oxidative phosphorylation.

In the case of complete oxidation of 4 molecules of glucose, the total theoretical yield can be around 36 to 38 ATP per glucose molecule, depending on the efficiency of the electron transport chain and how the protons are transferred across the mitochondrial membrane. Therefore, for 4 molecules, this would result in roughly 144 to 152 ATP.

On the other hand, while acetyl CoA and pyruvate can also lead to ATP production, they enter the citric acid cycle at different points and yield less ATP overall compared to the complete oxidation of glucose. Acetyl CoA is derived from glucose and other substrates, and pyruvate can also yield energy, but on a per molecule basis, they do not compare favorably to glucose in terms of total ATP yield from complete oxidation.

Thus, the complete oxidation of a larger number of glucose molecules leads to a higher total yield of ATP, making this option the most