下列说法中错误的是(   ) A.DNA上的一些具有特定遗传信息的片

下列说法中错误的是(  

ADNA上的一些具有特定遗传信息的片段叫基因

B.每种生物的细胞内,染色体的数量是一定的

C.细胞核是遗传信息库

D.染色体由RNA和蛋白质组成

答案

D

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