The 16srRNA or 18S rRNA Technique 口 In Prokaryotes: SS rRNA is too small. contains limited info 23S rRNA iS too large, too difficult to manage 16srRNA has the right size for studies 口 In Eukaryotes 18S rRNA iS used for phylogenetic measurementsThe 16S rRNA or 18S rRNA Technique In Prokaryotes: • 5S rRNA is too small, contains limited info • 23S rRNA is too large, too difficult to manage • 16S rRNA has the right size for studies In Eukaryotes: • 18S rRNA is used for phylogenetic measurements