Question

multiple choice question
beyond the primary structure of the order of amino acids in a protein chain, there are up to ______ levels of folding and association that lead to significant complexity and functional specificity.
o three
o two
o four
o five
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Explanation:

Proteins have four levels of structure - primary (amino - acid sequence), secondary (local folding like alpha - helices and beta - sheets), tertiary (3 - D structure of a single polypeptide), and quaternary (association of multiple polypeptides). Beyond the primary structure, there are three additional levels.

Answer:

A. three