Noncircular extragenomic dna in bacteria isn't a new thing, for example, the marine algae cyanothece has linear DNA, and iirc it is important in regulating day/

Noncircular extragenomic dna in bacteria isn't a new thing, for example, the marine algae cyanothece has linear DNA, and iirc it is important in regulating day/night cycles for nitrogen fixation (which is oxygen sensitive)