细胞核中转录而成的RNA要与核糖体结合来翻译相关蛋白质,需穿过几

细胞核中转录而成的RNA要与核糖体结合来翻译相关蛋白质,需穿过几层膜?(    )

A. 0层          B. 3层          C. 8层          D. 6层

答案

A


解析:

因为RNA是生物大分子,不能自由通过膜,而细胞核膜上有核孔是大分子物质出入细胞核的通道,因此RNA是通过核孔到达细胞质中的蛋白质合成场所核糖体上,作为模板来翻译合成蛋白质的,而核糖体是无膜结构的细胞器,所以需要穿过的膜为0层。

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