問題詳情

20.____ The feature that chemically distinguishes protein from carbohydrate and fat is the presence ofin the structure.
(A) carbon
(B) chlorine
(C) nitrogen
(D) hydrogen
(E) carboxyl groups

參考答案

答案:A
難度:困難0.272727
統計:A(9),B(4),C(7),D(4),E(5)

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