(09马鞍山市质量检测)海带细胞中碘的浓度比海水中高出许多倍,

09马鞍山市质量检测)海带细胞中碘的浓度比海水中高出许多倍,其原因是

     A.碘的穿透性特别强         B.碘能以主动运输方式进入细胞

     C.海水中碘含量高           D.海带细胞膜是全透性的

答案

答案:B

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