(A) Cellulose- a natural polymer of α−D−glucose, linked by glycoside linkage
(B) Nylon-66- a synthetic polymer of adipic acid and 1,6-diaminohexane. The diacid is linked with diamine through amide linkage
(C) Protein- a natural polymer of α−amino acids where individual amino acid units are linked by amide linkage
(D) Sucrose- has glycoside linkage, a disaccharide