American Society of Exercise Physiologists (ASEP) Board Practice Exam

The end product of glucose metabolism in glycolysis is pyruvate. During glycolysis, one molecule of glucose, which is a six-carbon sugar, undergoes a series of enzymatic reactions that ultimately break it down into two molecules of pyruvate, each containing three carbons. This process occurs in the cytoplasm of cells and is the first step in cellular respiration, allowing the cell to extract energy from glucose.

Glycolysis can occur in both aerobic and anaerobic conditions, and while pyruvate is formed under normal circumstances, it can be further converted into either acetyl-CoA or lactate depending on the availability of oxygen and the metabolic needs of the cell. In aerobic conditions, pyruvate is often transported into the mitochondria and converted to acetyl-CoA to enter the Krebs cycle, but this conversion occurs after glycolysis, making pyruvate the immediate end product. Other choices such as lactate represent a product of anaerobic glycolysis, and glycerol is a component of lipid metabolism rather than a direct product of glucose metabolism in glycolysis.