Question

Some proteins are an assembly of more than one polypeptide or subunits. The manner in which these individual folded polypeptides or subunits are arranged with respect to each other in the architecture of the protein is also known as

• A. primary structure
• B. secondary structure
• C. tertiary structure
• D. quaternary structure

Answer 1

The correct option is D quaternary structure

The linear sequence of amino acids forming a polypeptide chain in a protein is the "primary structure".

Small portions of the polypeptide chain fold to form helices and sheets. This is called the "secondary structure".

The secondary structure folds upon itself to form the 3 dimensional shape of the protein. This is the "tertiary structure" or the sub-unit of protein.

The assembly of more than one tertiary structures or protein sub-units to form a complete protein is called the "quaternary structure".