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| Description: The processing of ribosomal and transfer RNA.a) A large transcript is cleaved to produce rRNA and tRNA in E. coli. (b) Human rRNA genes are part of 40-kb repeating sequences that each produce three rRNAsThe processing of ribosomal and transfer RNA.a) A large transcript is cleaved to produce rRNA and tRNA in E. coli. (b) Human rRNA genes are part of 40-kb repeating sequences that each produce three rRNAs (a) E. coli RNA-coding gene 3! 165 tRNA 23S rRNA SS tRNA DNA 5' rRNA rRNA 0 Transcription produces lntervening a 305 pre-RNA. sequence Mm s' _3' 305 ppe-RNA' 16S tRNA 23SrRNA ss tRNA transcrlpt rRNA rRNA a RNA cleavage releases rRNAs and tRNAs. + + Ribosomal RNA 165 235 SS and - + - Transfer RNA tRNA tRNA (b) Human rRNA transcriptional unit, 13 kb Intergenic spacer l—TS |TS1 ITSZ .H. “27 kb .I DNA5’__-__I__—___/l___3' 285 o Transcription synthesizes a 45$ pre-rRNA transcript. Pre-rRNA 9—? 455 pre-rRNA transcript 185 5.85 285 a Pre-RNA cleavage produces three rRNAs. 5.85 - + h Ribosomal RNA 185 285 Picture Stats: Views: 57 Filesize: 362.48kB Height: 2245 Width: 1648 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48652 |