Quaternary structure of protein is:

Ans. D. The inter relation and arrangement of a polypeptides in the protein with more than 2 polypeptides chains)a. Protein that contain two or more polypeptide chains associated by non-covalent forces are said tob. exhibit quaternary structure.c. The arrangement sequence of amino-acids in the polypeptide chain -- is primary structure of protein.d. Inter relation of amino-acids in polypeptide chain is -- secondary structure.