AP Biology Practice Questions

Answer: B, 2. The Krebs’ cycle produces two molecules of ATP for every molecule of glucose.

Key Takeaway: A single run of Krebs’ cycle (one recycling of Acetyl-CoA) produces one molecule of ATP. Since glycolysis splits glucose into two pyruvate molecues, Krebs’ cycle runs twice for every one molecule of glucose. As a result, Krebs’ cycle produces two molecules of ATP for every molecule of glucose.