Question

select the correct answer. whats the role of oxygen in cellular respiration? a. it accepts electrons and keeps the electron transport chain running. b. it breaks down carbon - based sugar molecules to release energy and forms carbon dioxide. c. it combines with hydrogen ions in sugar molecules to release energy and form water. d. it supplies electrons to the electron transport chain to keep it running.

Explanation:

In cellular respiration, oxygen is the final electron - acceptor in the electron transport chain. It accepts electrons and hydrogen ions (protons) to form water, which keeps the electron transport chain running. Option B describes glycolysis and the citric acid cycle, not the role of oxygen. Option C is an inaccurate description of oxygen's role. Option D is incorrect as oxygen accepts electrons, not supplies them.

Answer:

A. It accepts electrons and keeps the electron transport chain running.