Which of These Determines the Quaternary Structure of a Protein

Multiple Choice

Which of these determines the quaternary structure of a protein?

A) Sequence of amino acids
B) Ratio of the number of acidic amino acids to the number of basic amino acids
C) Number of alpha helices and pleated sheets along the axis of the protein
D) Arrangement of subunits of amino acids that are held together by attractions between the chains
E) Arrangement of pleated sheets in the protein