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. Most of the energy from the original glucose molecule at that point in the process, however, is stored in the form of which of the following molecules?
A) acetyl-CoA
B) NAD⁺
C) pyruvate
D) NADH

Question

Quizplus · Accepted Answer

During glycolysis and the citric acid cycle, electron carriers such as NAD⁺ and FAD pick up electrons and become NADH and FADH₂. These carriers then donate their electrons to the electron transport chain, which ultimately generates ATP through oxidative phosphorylation. Therefore, most of the energy from the original glucose molecule is stored in the form of NADH at this point in the process.

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