Introns in pre-rrNa gene Only a few organisms' rRNA gene has introns Splicing剪接 does not need protein, Ribozyme is a catalytic RNA molecules that catalyze particular biochemical reactions in the absence of protein Introns that does not need proteins for splicing are categorized as the group i intron In mrna, trna rrna genes in mitochondria and chloroplasts of yeast/fungi. In rRNA genes of all insects In rRNA genes. In some mRNA and RNA genes of bacteriophageIntrons in pre-rRNA gene • Only a few organisms’ rRNA gene has introns • Splicing剪接 does not need protein, Ribozyme is a catalytic RNA molecules that catalyze particular biochemical reactions in the absence of protein • Introns that does not need proteins for splicing are categorized as the group I intron • In mRNA, tRNA & rRNA genes in mitochondria and chloroplasts of yeast/fungi. In rRNA genes of all insects. In rRNA genes. In some mRNA and tRNA genes of bacteriophage