17. Inside an active mitochondrion, most electrons follow which pathway? Select one: a. glycolysis NADH oxidative phosphorylation ATP oxygen b. citric acid cycle FADH2 electron transport chain ATP c. electron transport chain citric acid cycle ATP oxygen d. pyruvate citric acid cycle ATP NADH oxygen e. citric acid cycle NADH electron transport chain oxygen 18. The primary role of oxygen in cellular respiration is to Select one: a. yield energy in the form of ATP as it is passed down the respiratory chain b. act as an acceptor for electrons and hydrogen, forming water c. combine with carbon, forming CO2 d. combine with lactate, forming pyruvate e. catalyze the reactions of glycolysis 19. Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle? Select one: a. CO2 and glucose b. H20 and 02 c. ADP, Pi, and NADP+ d. ATP and NADPH 20. Which of the following statements best describes the relationship between photosynthesis and respiration? Select one: a. Respiration runs the biochemical pathways of photosynthesis in reverse. b. Photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules c. Photosynthesis occurs only in plants; respiration occurs only in animals. d. ATP molecules are produced in photosynthesis but not in aerobic respiration. e. Photosynthesis is catabolic; respiration is anabolic.