Bacteria possess a special form of DNA, the so-called supercoiled DNA. The existence of this form of DNA in bacteria is essential for their survival.
Eukaryotic cells do NOT contain supercoiled DNA.
Extra info: Only bacteria have supercoiled DNA
Supercoiling in bacteria is produced by folinic acid.
Extra info: Folinic acid is a premetabolite of the DNA compounds purines and pyrimidines; the supercoiling in established by the gyrase enzyme