Peptide linkage : Proteins are condensation polymers of `alpha`-amino acids in which the same or different `alpha`-amino acids are connected by peptide bonds . Chemically , a peptide bond is an amide linkage formed between -COOH group of one `alpha`-amino acid and `NH_(2)` group of the other `alpha`-amino acid by a molecular of water.
(ii) Glycosidic linkage : The two monosaccharides units are joined together through an oxide linkage formed by loss of a molecule of `H_(2)O` . such a linkage between two monosaccharides units through oxygen atom is called glycosidic linkage .
