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【单选题】
下面关于转录后加工,叙述不正确的是()。A.
转录作用产生出的 mRNA、tRNA及rRNA的初级转录本是前体RNA，而不是成熟的RNA。
B.
RNA的加工过程均在细胞核内进行。
C.
RNA加工类型包括剪切及剪接、末端添加核苷酸修饰和RNA编辑等
D.
真核生物的转录后加工较之原核生物更复杂。
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