Final answer:
The shaded portions of the molecule represent different polypeptide chains, which are chains of amino acids that form proteins.
Step-by-step explanation:
The shaded portions of the molecule in the accompanying figure represent different polypeptide chains. Polypeptide chains are chains of amino acids that are linked together to form proteins. Each chain is made up of a specific sequence of amino acids and can have different levels of structure, including primary, secondary, tertiary, and quaternary structure.