Processing of pre-TRNA Cleavage is by ribonucleases,核糖 N Processing of pre-rRNA Transcription 核酸酶,RNA酶 45S pre-rRNA 圈3 ·5.8 SrRNA iS H ETS bonded to 28S rrNa Cleavage in mature ribosome 41spre·rRNA 20S pre-rRNA 32S pre-rRNA folding H bonds 18S rRNA 5.8S rRNA 28S rRNA Hydrogen-bonded to28 s rRNA in画 mature ribosome 5.8S rRNAProcessing of pre-rRNA • Cleavage is by ribonucleases, 核糖 核酸酶, RNA酶 • 5.8S rRNA is H￾bonded to 28S rRNA in mature ribosome