They resemble a single stranded circular RNA plasmid, stuck together into a hairpin shape. Plant viroids are 250-450 bases long, while obelisks seem to be in th

They resemble a single stranded circular RNA plasmid, stuck together into a hairpin shape. Plant viroids are 250-450 bases long, while obelisks seem to be in the 1000-1200 range. https://en.wikipedia.org/wiki/Circular_RNA https://en.wikipedia.org/wiki/Circular_RNA -- https://en.wikipedia.org/wiki/Hepatitis_D https://en.wikipedia.org/wiki/Hepatitis_D