Where do we find DNA in eukaryotic cells?
![](https://i0.wp.com/qcebiologyrevision.com/wp-content/uploads/2020/07/IMG_0789.png?resize=580%2C449&ssl=1)
Bound to proteins (histones) in chromosomes in the nucleus (DNA + all the proteins associated with it (mainly histones) = chromatin).
Plus in chloroplasts and mitochondria.
Where do we find DNA in prokaryotic cells?
![](https://i0.wp.com/qcebiologyrevision.com/wp-content/uploads/2020/10/1200px-Plasmid_english.svg_-1.png?resize=580%2C272&ssl=1)
As unbound circular DNA in the cytosol (this is QCAA’s phrasing, but this is technically known as the genophore)
Small rings of DNA called plasmids may also be present.
NB: The generalisation that ALL prokaryotes have circular genomes is incorrect. A growing number of prokaryotes have been discovered which have linear chromosomes, such as Borreliaburgdorferi, which causes Lyme disease; members of the Streptomyces family and Agrobacterium tumafaciens, which has both a circular and a linear chromosome.
State two of the differences between DNA found in eukaryotes and prokaryotes.