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【单选题】
生物体内的蛋白质千差万别,其原因不可能是( )A.
组成蛋白质的氨基酸种类和数量不同
B.
氢基酸的排列顺序不同
C.
蛋自质的空间结构不同
D.
每种氨基酸分子全都含一个氨基和一个羧基
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