The right option is D. quaternary
A protein containing more than one polypeptide chain exhibits the quaternary level of protein structure.
Proteins are macromolecules that possess four different levels of structure which are; primary, secondary, tertiary and quaternary. The quaternary level of protein is the structure that is formed by the arrangement of various polypeptides to produce a larger functional protein. The shape is then stabilized through many non-covalent interactions such as hydrogen-bonding, ionic interactions, and Vander Waals Forces.
Answer:
I think so the answer of this question is Quaternary.
Explanation:
Many proteins are made up of a single polypeptide chain and have only three levels of structure 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.
