Match the level of protein structure to its definition. __ Primary Structure  __ Secondary Structure  __ Tertiary Structure  __ Quaternary Structure  A. The fully folded three dimensional structure of a single polypeptide chain. B. Structures formed due to hydrogen bonding between carbonyl oxygen and amide hydrogen in the polypeptide backbone. C. The sequence of amino acids in a polypeptide; also, chemical structure. D. The organization of subunits in a multi-subunit protein.

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