下列形成蛋白质分子结构的层次,从小到大的顺序是(  ) ①氨基

下列形成蛋白质分子结构的层次,从小到大的顺序是(  )

①氨基酸    ②C、H、O、N等元素   ③氨基酸脱水缩合  ④一条或几条肽链接在一起    ⑤多肽    ⑥蛋白质

A.②①③④⑤⑥             B.①②③④⑤⑥

C.②①⑥③④⑤             D.②①③⑤④⑥

答案

D

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