Does DNA Occur as a Complete Uniform Ring Structure?

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DNA can occur as a complete uniform ring, particularly in certain organisms. Bacteria possess circular chromosomes and plasmids, while circular DNA is also found in mitochondria, chloroplasts, and some viral genomes. The concept of topologically non-linked circular duplex DNA is relevant in this context, highlighting the structural variations of DNA beyond the typical linear strand.
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Does DNA ever occur as a complete uniform ring, rather than a(n approximate) strand?
 
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Yes, bacteria have circular chromosome(s) and circular plasmid(s).
 
Also DNA present in mitochondria, chloroplasts and some viral genomes is circular.
 
Topologically Non-linked Circular Duplex DNA

Here's a good PDF on this topic.
 
NanoTech said:
Here's a good PDF on this topic.
:confused:
Where?
 

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