不含有害物质的明胶,可以在制药与食品工业中使用.明胶里含有多种蛋白质,其中某蛋白质在人体内水解产物之一为苯丙氨酸(化学式为C 9 H 11 O 2 N).下列对相关物质的说法正确( )
A.
苯丙氨酸由23个原子构成
B.
苯丙氨酸分子由碳、氢、氧、氮四种元素组成
C.
苯丙氨酸为有机物,明胶为混合物
D.
苯丙氨酸中氢元素的质量分数最大
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