Cellular Respiration Practice Exam - Study Guide & Practice Questions

The net yield of ATP produced in glycolysis is 2 ATP. During the glycolysis process, a total of 4 ATP molecules are generated through substrate-level phosphorylation. However, 2 ATP molecules are consumed in the initial steps of glycolysis to phosphorylate glucose and its intermediates. Therefore, when you subtract the 2 ATP molecules used from the 4 ATP produced, you arrive at a net gain of 2 ATP.

This aspect of glycolysis highlights its role in energy metabolism, as it allows cells to generate energy quickly, even in anaerobic conditions. The process also produces pyruvate and electron carriers in the form of NADH, which are essential for further energy production in cellular respiration.