A. C6H12O6 + 6 H2O -> 6 CO2 + 6 O2: This equation incorrectly lists water as a reactant instead of oxygen. Aerobic catabolism requires molecular oxygen as the terminal electron acceptor in the electron transport chain. Metabolism of glucose without oxygen input prevents oxidative phosphorylation. B. C6H12O6 + 6 O2 -> 6 CO2 + 6 H2O: Hexose oxidation involves the complete breakdown of glucose in the presence of oxygen. This metabolic pathway yields carbon dioxide and water as primary byproducts while capturing chemical energy. It accurately reflects the stoichiometric balance of aerobic cellular respiration. C. C6H12O6 + 6 CO2 -> 6 O2 + 6 H2O: Carbon dioxide functions as a metabolic waste product rather than a reactant in human cellular respiration. Glucose does not react with carbon dioxide to produce oxygen during heterotrophic metabolism. This chemical arrangement reverses the standard physiological gas exchange. D. CO2 + 6 H2O -> C6H12O6 + 6 O2: This formula represents the endergonic process of photosynthesis occurring in photoautotrophic organisms. It describes the fixation of inorganic carbon into organic compounds using light energy. Eukaryotic animal cells lack the chloroplasts necessary to drive this specific anabolic reaction. E. 6 O2 + 6 H2O -> C6H12O6 + 6 CO2: The combination of oxygen and water does not spontaneously synthesize glucose molecules in biological systems. This equation fails to account for the carbon source required for carbohydrate formation. It violates the fundamental thermodynamic principles governing respiratory substrate breakdown and energy release.