甲培养基中含有15N标记的尿嘧啶核糖核苷酸,乙培养基中含有3H标记

甲培养基中含有15N标记的尿嘧啶核糖核苷酸,乙培养基中含有3H标记的胸腺嘧啶脱氧核苷酸,分别用这两种培养基培养人的胰岛B细胞,细胞对这两种物质的吸收量(  )

A.甲大于乙 B.乙大于甲  C.甲等于乙  D.无法确定

 

答案

A

胰岛B细胞是已分化的成熟细胞,不再进行细胞分裂,不发生DNA复制,不消耗胸腺嘧啶脱氧核苷酸;蛋白质(胰岛素)合成旺盛,转录翻译过程强,需利用尿嘧啶核糖核苷酸。

 

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