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4_RNA_Processing - RNA Processing Prokaryotic RNAs Put the...

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2/6/07 RNA Processing Prokaryotic RNAs Put the genes together and make them share the same promoter - only one place where transcription can be initiated - Polycistronic mRNAs o contains the information from many genes o doesn’t need to be but apart or anything o (start------Gene A------stop) (Starts again with new ribosomes ----Gene B-----stop)….etc. - RNA Processing or Post-transcriptional modification o Changes to the RNA after transcription that RNA polymerase can’t do o Processing occurs between translation and transcription No there is NO RNA PROCESSING on the mRNA Because translation and transcription occurs at the same time - rRNAs : o transcript will NOT be translated, so they must be CLEAVED with Endonucleases after they’re cut, the RNAs are individuals and they can go off and do what they need to do to translate - tRNAs : transcript cleaved, rare bases o enzymes act on the tRNA to chemically change adenine into inosine, but is really rare - some tRNAs will be mixed in with the rRNA o Eukaryotic RNAs
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