肽链骨架的重复单位是:-N-Cα-C-

多肽链具有方向性:从氨基末端走向羧基末端(N—>C端

肽键:由一个氨基酸的a-羧基与另一个氨基酸的a-氨基脱水生成的共价键

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肽平面 影响蛋白质折叠- -角度- - 空间位阻

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