Circular DNA

Circular DNA is a form of DNA that is found in bacteria and archaea as well as in eukaryotic cells in the form of mitochondrial DNA.

While the individual strands of a linear double helix represent two distinct and separable molecules, this need not be true for circular DNA. If the strands twist an odd number of times around one another in completing the DNA loop, then they are covalently joined into a single molecule.

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