Mycoplasmas (Mollicutes) have a low number of rRNA genes.
DNA from Mycoplasma, Ureaplasma, Acholeplasma, and Spiroplasma species digested by restriction endonucleases was hybridized with probes consisting of portions of the rrnB rRNA operon of Escherichia coli and the rRNA operon of Mycoplasma capricolum. The results indicate the presence of only one or two sets of rRNA genes in the genome of Mollicutes linked in the procaryotic fashion, 16S-23S-5S.
D000127:Acholeplasma / Q000235:genetics; D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial; D009174:Mycoplasma / Q000235:genetics; D009179:Mycoplasmatales / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D009876:Operon; D012329:RNA, Bacterial / Q000235:genetics*; D012335:RNA, Ribosomal / Q000235:genetics*; D013149:Spiroplasma / Q000235:genetics; D014509:Ureaplasma / Q000235:genetics
D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012335:RNA, Ribosomal