Final answer:
The end product of glycolysis that is mentioned in this question is NADH. This is a result of the conversion of glucose into pyruvate during glycolysis, which also produces a small amount of ATP but does not produce FADH2, acetyl CoA, citric acid, or O2.
Step-by-step explanation:
The end products of glycolysis include several substances, but when we focus on the specific products listed, NADH is the one that is directly produced by glycolysis. The end products of glycolysis include two molecules of pyruvate, two net molecules of ATP, and two molecules of NADH.
Other substances like FADH₂ and acetyl CoA are generated during further stages of cellular respiration, such as the Krebs cycle, and not during glycolysis itself. FADH₂, for example, is a product specifically produced during the Krebs cycle and plays a crucial role in the final stages of aerobic respiration.
Acetyl CoA is what the pyruvate from glycolysis is converted into before entering the Krebs cycle, and it is not a direct product of glycolysis. Oxygen (O₂) is not a product of glycolysis; instead, it's used as the final electron acceptor in the electron transport chain of aerobic respiration.