Question

multiple choice question
the association of two or more polypeptide chains by noncovalent bonds is called the ______ level of a protein.
o primary
o secondary
o tertiary
o quaternary

Explanation:

The primary level of a protein is the linear sequence of amino - acids. The secondary level consists of local folding patterns like alpha - helices and beta - sheets. The tertiary level is the three - dimensional structure of a single polypeptide chain. The quaternary level is the association of two or more polypeptide chains through noncovalent bonds.

Answer:

Quaternary