Final answer:
After glycolysis and the citric acid cycle, the carbon skeleton of glucose is broken down to CO₂. The majority of the energy from glucose is stored in energy-carrier molecules such as NADH and FADH₂.
Step-by-step explanation:
After the completion of glycolysis and the citric acid cycle, the carbon skeleton of glucose has been broken down into carbon dioxide (CO₂). Most of the energy from the original glucose molecule is stored in the form of energy-carrier molecules such as NADH and FADH₂. These molecules will then transfer the stored energy to the electron transport chain and oxidative phosphorylation, where it will be used to produce ATP.