These higher-order multiple-choice questions check for understanding of energy in living systems; glycolysis; oxidation of pyruvate & the citric acid cycle; oxidative phosphorylation; metabolism without oxygen; connections of carbohydrate, protein, & lipid metabolic pathways; and regulation of cellular respiration. Advanced Placement® and AP® are trademarks registered and/or owned by the College Board, which is not affiliated with, and does not endorse, this textbook.