含有内含子和外显子的RNA是A.mRN B.rRN C.tRN D.hnRN E.snRN

作者: tihaiku 人气: - 评论: 0
问题 含有内含子和外显子的RNA是
选项 A.mRN B.rRN C.tRN D.hnRN E.snRN
答案 D
解析 [考点]RNA的生物合成 [分析]hnRNA即不均一核RNA,是mRNA的前体,DNA转录时基因的非编码片段内含子和编码片段外显子都一齐转录成为hnRNA,要剪去内含子,接起外显子才成为mRNA(当然还要戴“帽”加“尾”)。

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