阿摩線上測驗
19. Which of the following proteins is absent α-helices in its secondary structure?
(A) Hemoglobin
(B) Insulin
(C) Chymotrypsin
(D) Collagen
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統計： A(1), B(1), C(1), D(4), E(0) #3331913
統計： A(1), B(1), C(1), D(4), E(0) #3331913
