Question

lets again consider the overall redox reaction that occurs from the beginning of glycolysis to the end of the electron transport chain: which statements accurately summarize the events of cellular respiration? select all that apply. at the end of the electron transport chain, the energy that was originally in glucose is now in the form of atp. carbon atoms in glucose are oxidized during glycolysis, pyruvate processing, and the citric acid cycle. oxygen is reduced to form water at complex iv of the electron transport chain.

Explanation:

• For the first option: Cellular respiration converts the energy in glucose to ATP. Through glycolysis, pyruvate processing, citric acid cycle, and electron transport chain (ETC), the energy stored in glucose is harnessed and used to synthesize ATP. At the end of ETC, the energy originally in glucose is transferred to ATP.
• For the second option: In glycolysis, glucose (with carbon atoms) is broken down. Pyruvate (from glycolysis) is processed (loses a carbon as \(CO_2\)). In the citric acid cycle, further oxidation (loss of electrons, which is what oxidation means in redox terms) of carbon - containing molecules (derived from glucose) occurs, and \(CO_2\) is released. So carbon atoms in glucose are oxidized during these processes.
• For the third option: In the electron transport chain, at Complex IV (cytochrome c oxidase), electrons are passed to oxygen (\(O_2\)). \(O_2\) gains electrons (reduction) and combines with protons (\(H^+\)) to form water (\(H_2O\)).

Answer:

All of the options (the first, second, and third statements) are correct.