Prokaryotic DNA is found in the nucleoid region and plasmids. Eukaryotic DNA is found in the nucleus, mitochondria, and chloroplast.
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Prokaryotes do not have a nucleus, so their DNA is found in the nucleoid region not protected by a membrane such as a nucleus. Prokaryotes may also have plasmids, extra DNA that is not needed for survival but which may provide traits such as antibiotic immunity. Eukaryotes have most of their DNA in the nucleus, although the entire genome also includes bacteria found inside the mitochondria and chloroplast. The DNA in these organelles are explained by the theory of endosymbiosis.