mrna前体 meaning in Chinese

precursor mrna

Rna polymerase i synthesizes the three largest rrnas . rna polymerase ii mainly produces mrna encoding proteins and most of sn rnas , and rna polymerase iii makes 5s rrna and trna , as well as a few small nuclear rnas . the transcription sites of the polymerases have been studied since early 1980s
真核生物细胞核中有三种rna聚合酶，即rna聚合酶、和，它们分别转录产生不同的rna ，其中rna聚合酶( pol )转录合成45srrna前体；聚合酶( pol )转录合成mrna前体及大多数snrna ；聚合酶( pol )转录合成5srrna 、 trna和一些小分子rna 。