The 16S ribosomal ribonucleic acid, often shortened to 16S rRNA, is an important constituent of the small subunit (SSU) of prokaryotic ribosomes as well as mitochondria and chloroplasts.
How the 16S rRNA is involved in a prokaryotic ribosome
DNAsegment coding for rRNA is called either rRNA gene or rDNA. For the purposes of sequencing, sequence information is obtained from the 16S gene because DNA is much easier to process and sequence vs RNA.
To use as a barcode, a gene should have the following characteristics.