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Biology 121 Exam 3 Study Guide 2025 Questions and Answers Where is ATP synthase located in the mitochondrion? - ....ANSWER☑️☑️...-Inner Membrane The direct energy source that drives ATP synthase during respiratory oxidative phosphorylation is ... - ....ANSWER☑️☑️...-The difference in H+ concentrations on opposite sides of the inner mitochondrial membrane Energy released by the electron transport chain is used to pump H+ ions into which location? - ....ANSWER☑️☑️...-Mitochondrial intermembrane space The primary role of oxygen in cellular respiration is to - ....ANSWER☑️☑️...-act as an acceptor for electrons and hydrogen, forming water Where are the proteins of the electron transport chain located? ....ANSWER☑️☑️...-Mitochondrial inner membrane Carbon dioxide (CO2) is released during which of the following stages of respiration? - ....ANSWER☑️☑️...-Oxidation of pyruvate to acetyl CoA and the citric acid cycle According to the Citric Acid Cycle how many molecules of carbon dioxide (CO2) would be produced by five turns of the citric acid cycle? - ....ANSWER☑️☑️...-10 Which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of carbon (CO2) from one molecule of pyruvate? ....ANSWER☑️☑️...-Acetyl CoA FOR STUDY PURPOSES ONLY ©️ 2025 ALL RIGHTS RESERVED 1