When proteins are made up of several polypeptide chains,the arrangement of these chains is referred to as the:
A)primary structure
B)secondary structure
C)tertiary structure
D)quaternary structure

Question

Quizplus · Accepted Answer

The quaternary structure refers to the arrangement of multiple polypeptide chains to form a functional protein complex. Therefore, when a protein is made up of several polypeptide chains, it is referring to its quaternary structure. The primary structure is the linear sequence of amino acids in a single polypeptide chain, the secondary structure refers to the local folding patterns (such as alpha-helices or beta-sheets) of a single polypeptide chain, and the tertiary structure refers to the overall 3D shape of a single polypeptide chain.

When Proteins Are Made Up of Several Polypeptide Chains,the Arrangement