Question

multiple choice question
some proteins can assume a level of ______ structure in which two or more polypeptides assemble to form a larger, multiunit protein.
o primary
o tertiary
o secondary
o quaternary

Explanation:

Protein structure has four levels. Primary is the linear sequence of amino - acids. Secondary involves local folding like alpha - helices and beta - sheets. Tertiary is the 3 - D structure of a single polypeptide. Quaternary structure is when two or more polypeptides assemble to form a multi - unit protein.

Answer:

quaternary