Question

these figures show the four levels of protein structure: primary, secondary, tertiary, and quaternary structure. which level of protein structure is characteristic of some, but not all, proteins? quaternary level of protein structure tertiary level of protein structure secondary level of protein structure

Explanation:

Primary structure is the linear sequence of amino - acids. Secondary structure involves local folding like alpha - helices and beta - sheets. Tertiary structure is the 3 - D shape of a single polypeptide chain. Quaternary structure exists only in proteins composed of multiple polypeptide subunits. Not all proteins have multiple subunits.

Answer:

Quaternary level of protein structure