Classes of rna Pre-RNA, EARNA: The primary transcript has the same organization as the gene hnrNA, heterogeneous nuclear RNA,核内不均一RNA: Eucaryotic RNa Pol Ii transcribes a variety of different genes SnRNA, small nuclear rna,核内小RNA: is any one of many small RNA species confined to the nucleus: several of the snrNas are involved in splicing or other rna processing reactions SCRNA, small cytoplasmic rna,胞内小RNA: several molecules present in the cytoplasm and(sometimes ) nucleus ·rRNA, ribosomal rna,核糖体RNA: Serve as components of ribosomes tRNA: transfer RNA, #ERNA: carrying an amino acid; the covalent linkage is between the nh2 group of the amino acid and either the 3-or 2-oh group of the terminal base of the trNA mRNA, messager RNA, ERNA: carries genetic message from the chromosome to the ribosomesClasses of RNA • Pre-RNA, 前体RNA: The primary transcript has the same organization as the gene • hnRNA, heterogeneous nuclear RNA, 核内不均一RNA: Eucaryotic RNA Pol II transcribes a variety of different genes • snRNA, small nuclear RNA, 核内小RNA: is any one of many small RNA species confined to the nucleus; several of the snRNAs are involved in splicing or other RNA processing reactions • scRNA, small cytoplasmic RNA, 胞内小RNA: several molecules present in the cytoplasm and (sometimes) nucleus • rRNA, ribosomal RNA, 核糖体RNA: Serve as components of ribosomes • tRNA: transfer RNA, 转移RNA: carrying an amino acid; the covalent linkage is between the NH2 group of the amino acid and either the 3´- or 2´-OH group of the terminal base of the tRNA t • mRNA, messager RNA, 信使RNA: carries genetic message from the chromosome to the ribosomes