第七章 RNa Processing In both prokaryotes and eukaryotes, primary RNA transcripts undergo various alteration or processing events to become mature RNAs The three commonest types are: 1, nucleotide removal by nucleases 2. nucleotide addition to the 5,-or 3-end 3. nucleotide modification on the base or the sugar.第七章 RNA Processing In both prokaryotes and eukaryotes, primary RNA transcripts undergo various alteration or processing events to become mature RNAs: The three commonest types are: 1, nucleotide removal by nucleases; 2, nucleotide addition to the 5’- or 3’-end, 3, nucleotide modification on the base or the sugar