What is the main product of glycolysis?

• A. Glucose
• B. Lactic acid
• C. Pyruvate
• D. Acetyl CoA

Answer: (C)

The primary product of glycolysis is pyruvate. During the glycolysis pathway, which occurs in the cytoplasm of the cell, one molecule of glucose (a six-carbon sugar) is broken down through a series of enzymatic reactions into two molecules of pyruvate (a three-carbon compound). This process involves several key steps, including phosphorylation and substrate-level phosphorylation, ultimately producing a net gain of two molecules of ATP and two molecules of NADH along with the two pyruvate molecules.

While glucose is the starting material for glycolysis, it is not a product of this process; instead, it is consumed. Lactic acid can be produced from pyruvate under anaerobic conditions, but it is not directly a product of the glycolysis pathway itself. Acetyl CoA is produced in subsequent stages, particularly during the transition from glycolysis to the Krebs cycle, when pyruvate is converted to Acetyl CoA through the action of the pyruvate dehydrogenase complex. Thus, the correct answer highlights the direct outcome of the glycolytic pathway.