题干

下列有关组成生物体的化学元素的说法中,不正确的是(    )

A:在内环境中可以发现由碘参与组成的甲状腺激素

B:C,H,O,N,P,K,Ca,Mg都是大量元素,C在各种有机物中都存在

C:在肺炎双球菌的化学组分中,P元素仅存在于DNA和RNA分子中

D:微量元素虽然含量少,但它们既参与细胞结构组成,也参与细胞的代谢调节

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C

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