56. What is the basic structure of collagens?
(A) Single polypeptide chain
(B) Double helix
(C) Triple helix
(D) Quadruple helix
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統計: A(0), B(0), C(5), D(1), E(0) #3331950
統計: A(0), B(0), C(5), D(1), E(0) #3331950