Which of the following nucleic acids is present in an organism...

Double-stranded circular naked DNA type of nucleic acid is present in an organism having $70 \mathrm{~S}$ ribosomes. These are present in prokaryotic organisms or cells. All prokaryotic cells have a single double-stranded (double helix), circular DNA molecule for their genetic material. This DNA is attached to the inner cell membrane where the DNA replicating machinery is located. The DNA is "naked", it does not have proteins associated with it as eukaryotic DNA does.