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真核生物RNA聚合酶I存在于核仁中,其功能是合成( )。

单选题
2022-04-02 11:45
A、mRNA 和SnRNA
B、tRNA
C、5.8S r RNA、18S r RNA、28S r RNA
D、5 S r RNA
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正确答案
C

试题解析

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原核生物与真核生物RNA转录的区别:(1)真核生物RNA的转录是在()内,翻译在()中进行;原核生物则在核区同时进行转录和翻译。(2)真核生物一个mRNA只编码()基因;原核生物一个mRNA编码()基因。(3)真核生物有RNA聚合酶Ⅰ、Ⅱ、Ⅲ等三种不同的酶;原核生物则只有一种RNA聚合酶。(4)真核生物中转录的起始更复杂,RNA的合成需要转录因子的协助进行转录;原核生物则较为简单。(5)真核生物的mRNA转录后进行加工,然后运送到细胞质中进行翻译;原核生物无需进行加工,边转录边翻译。
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真核生物RNA聚合酶I催化转录的产物是( )
biomembrane,or biological membrane (生物膜)
原核生物只有一种RNA聚合酶而真核生物有三种,每一种都有某特定的功能。聚合酶I合成(),聚合酶II合成(),聚合酶III合成()和()。三种聚合酶都是具有多亚基的大的蛋白()。有些亚基是各种聚合酶共有的,有些只是某种聚合酶才有。最大的亚基与()的RNA聚合酶合同源。
关于真核生物RNA聚合酶叙述正确的是()。
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