转录起始复合物指的是A．RNA聚合酶核心酶-DNA-pppGpN-OHB．RNA聚合酶核心酶-DNA-引物-ppPGpN'-OHC．RNA聚合酶...

作者: rantiku 人气: - 评论: 0

问题转录起始复合物指的是

选项 A．RNA聚合酶核心酶-DNA-pppGpN-OH B．RNA聚合酶核心酶-DNA-引物-ppPGpN'-OH C．RNA聚合酶全酶-DNA-引物-pppGpN'-OH D．RNA聚合酶全酶-DNA-pppGpN'-OH E．亚基-DNA-pppGpN'-0H

答案 D

解析：转录起始不需要引物，在RNA聚合酶作用下直接催化NTP，按碱基配对原则以氢键结合于DNA模板上，在起始点上形成第一个磷酸二酯键。5'-端通常为pppG或pppA。第二个核苷酸有游离的3'-OH，可以加人下一个NTP。RNA聚合酶全酶-DNA-pppGpN，-OH称为转录起始复合物。

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转录起始复合物指的是A．RNA聚合酶核心酶-DNA-pppGpN-OHB．RNA聚合酶核心酶-DNA-引物-ppPGpN'-OHC．RNA聚合酶...

相关内容：起始,核心,-DNA-pppGpN-OHB.RNA,引物,-ppPGpN,-OHC.RNA

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