rna rrna 中文意思是什麼
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It is toxic for most mammalian cells since ricin a chain ( rta ) is an rna specific n - glycosidase that removes a specific adenine residue in a highly conservative region from among over 4000 nucloside residues present in 28s rrna, and causes protein synthesis inhibition and cell death
Rta具有n -糖苷酶活性，可催化28srrna在4234位脫去腺嘌呤，使核糖體60s亞基失活，從而抑制蛋白質合成，導致細胞死亡。 b鏈（ rtb ）是結合鏈，能和細胞表面半乳糖受體結合，協助a鏈進入細胞內。 -
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
真核生物細胞核中有三種rna聚合酶，即rna聚合酶、和，它們分別轉錄產生不同的rna ，其中rna聚合酶（ pol ）轉錄合成45srrna前體；聚合酶（ pol ）轉錄合成mrna前體及大多數snrna ；聚合酶（ pol ）轉錄合成5srrna 、 trna和一些小分子rna 。 -
Rna polymerase synthesizes the three largest rrnas, 5. 8s, 18s and 28s rrna. rna polymerase mainly produces mrna encoding proteins, and rna polymerase makes 5s rrna and trnas, as well as a few small nuclear rnas. the transcription sites of the polymerases have been studied since early 1980s
在細胞中它們的功能各不相同： rna聚合酶負責催化合成5 . 8s 、 18s和28srrna ， rna聚合酶主要負責mrna的轉錄合成，而rna聚合酶則負責催化5srrna 、 trna 、多數的snrna以及某些病毒基因（如va基因）等的轉錄。
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