2. A protein's _______ structure contains helixes and sheets that result from hydrogen bonding between carboxyl and amino groups of the polypeptide chain.
(A) primary
(B)secondary
(C) tertiary
(D) quaternary
(E) both secondary and quaternary
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氫鍵（黃色點）穩定一個α-螺旋蛋白質的二...
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