Define the following as related to proteins :
(i) Peptide linkage
(ii) Primary structure
(iii) Denaturation

Explanation

(i) Peptide linkage. Peptide bond is formed by the condensation of two or more, same or different a-amino acids. The condensation occurs between amino acids with the elimination of water. In this case, the carboxyl group of one amino acid and amino group of another amino acid get condensed with the elimination of water molecule.
The resulting `-overset(O)overset(||)C-NH-` linkage is called peptide linkage. The formation of a dipeptide and the peptide linkage is shown below :

(ii) Primary structure. The primary structure of proteins gives the sequence in which the amino acids are linked in one or more polypeptide chains of proteins. This is shown below

(iii) Denaturation. A process that changes the physical and biological properties of proteins without affecting the chemical composition of a protein is called denaturation. The denaturation is caused by certain physical or chemical treatments such as changes in pH, temperature, presence of some salts or certain chemical agents.