Peptides
Peptides are condensation products of two or more amino acids.
Two molecules of different amino acids can form two dipeptides. Three molecules of different amino acids can give six tripeptides.
Dipeptide has only one peptide bond, tripeptide has two peptide bonds and so on. Thus, a polypeptide made up of n-amino acids has( n – 1) peptide bonds.
Polypeptides
Condensation Products of many amino acids( „ In P xiucts of many amino acids( ≈ 10000) is known as polypeptide and those polypeptides which have molecular mass above than 10000 are called proteins.
Proteins
They are linear polymers of a-amino acids. Structure of Proteins( a) Primary structure It simply reveals the sequence of amino acids.
( b) Secondary structure α-helix structure maintained by hydrogen bonds or β-pleated sheet structure when R is small group.