BIOMOLECULES AND ENZYMES

Detailed explanation-1: -However, some proteins are made up of multiple polypeptide chains, also known as subunits. When these subunits come together, they give the protein its quaternary structure.

Detailed explanation-2: -Quaternary structure exists in proteins consisting of two or more identical or different polypeptide chains (subunits). These proteins are called oligomers because they have two or more subunits.

Detailed explanation-3: -Hemoglobin. Hemoglobin has a quaternary structure. It consists of two pairs of different proteins, designated the and chains.

Detailed explanation-4: -Quaternary structure refers only to proteins that are composed of multiple polypeptides. These separate polypeptides are held together by the same intermolecular forces found in secondary and tertiary structures.

Detailed explanation-5: -Proteins made from a single polypeptide will not have a quaternary structure. In proteins with more than one subunit, weak interactions between the subunits help to stabilize the overall structure.