Biochemistry General 3ff101b7 The primary structure of a protein refers to A Linear structure and order of the amino acids present B Regular confirmational forms of a protein C Complete three-dimensional structure of the polypeptide units of a given protein D Subunit structure of the protein High-Yield Explanation The linear sequence of amino acid residues and location of disulphide bridges, if any, in a polypeptide constitute its primary structure.