Illustrate a glycosidic, peptide and a phospho-diester bond.

(a) Glycosidic bond is formed normally between C-1 and C-4, of adjacent monosaccharide units.

(b) Peptide bond is a covalent bond that is formed between two adjacent amino acids by condensation of NH2 gp of ane amino acid and cp oh gp of other amino acid and hence it can be depicted as

P

II - OH

C

(c) Phosphodiester bond is a strong covalent bond formed between phosphate and two adjacent sugar groups. Such bonds form the sugar phosphate backbone of nucleic acids.