The statement "multiple polypeptide chains are held together by a variety of bonds" refers to the quaternary structure of proteins. Quaternary structure pertains to the assembly of multiple polypeptide subunits into a single functional protein complex, with interactions such as hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges holding them together.
decide is each statement is referring to primary, secondary, tertiary, or quaternary structures of proteins:
multiple polypeptide chains are held together by a variety of bonds
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