16. What do H2O, NaCl, CO2, and HCl all have in common? A. all salts B. all acids C. all gases D. all inorganic E. all solutes 17. Which of the following functional groups is mismatched to the organic compound? A. phosphate - carbohydrates B. sulfhydryl - proteins C. amino - proteins D. hydroxyl - alcohols E. carboxyl - fatty acids 18. The building blocks of an enzyme are A. nucleotide s. B. glycerol and fatty acids. C. monosaccharid es. D. phosphate, glycerol, fatty acids. E. amino acids. 19. All of the following are monosaccharides except A. glucos e. B. glycoge n. C. fructos e. D. ribos e. E. deoxyribos