Following glycolysis and the citric acid cycle,but before the electron transport chain and oxidative phosphorylation,the carbon skeleton of glucose has been broken down to CO₂ with some net gain of ATP.However,what is most of the energy from the original glucose molecule at that point in the process in the form of?

Question

Quizplus · Accepted Answer

Most of the energy from the original glucose molecule at this point in the process is in the form of NADH. NADH is produced in both glycolysis and the citric acid cycle and carries high-energy electrons that will be used in the electron transport chain and oxidative phosphorylation to generate a large amount of ATP. Acetyl-CoA is an intermediate in the citric acid cycle, glucose is the starting molecule of the process, pyruvate is an intermediate in glycolysis, and FADH₂ is also a high-energy electron carrier that is produced later in the citric acid cycle. However, NADH is the most direct and abundant product of the first two stages of cellular respiration.

Following Glycolysis and the Citric Acid Cycle,but Before the Electron