試題詳解

20. What is the tertiary structure of a protein
(A) order in which amino acids are joined in a polypeptide chain
(B) unique three-dimensional shape of the fully folded polypeptide
(C) organization of a polypeptide chain into an o-helix or B-pleated sheet
(D) overall protein structure resulting from the aggregation of two or more polypeptide subunits