Protein has a unique primary structure and has a unique feature that distinguishes it from other proteins. A set of individual proteins in the cell performs a set of diverse and complex functions. Ligand is necessary for protein functioning. Ligands are low molecular weight substances and macromolecules. The interaction of protein with Ligand is determined by the structure of a protein. This structure is known as the center of protein binding to the Ligand or the active center. The active center of proteins is a part of the protein molecule ...