Rock the Red Seal Cosmetology Exam 2026 – Style Your Future with Confidence!

A polypeptide chain is not a type of protein because a protein is a larger structure made up of one or more polypeptide chains. A polypeptide chain is also not a long chain of sugars as it is composed of amino acids, not sugars. Additionally, a polypeptide chain is not a sequence of DNA bases, as DNA codes for the sequence of amino acids, but it is not the actual polypeptide chain itself. The correct definition of a polypeptide chain is a long chain of amino acids linked by peptide bonds, which then fold and interact to form a protein.