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All cells can be classified as either prokaryotic or eukaryotic. Both classes of cells have a plasma membrane, cytosol, ribosomes, and DNA. In prokaryotic cells, the DNA is in the nucleoid region of the cytosol, while eukaryotic cell DNA is in a membrane-enclosed nucleus. Eukaryotic cells have multiple, linear chromosomes, while prokaryotic cells typically have a single, circular chromosome.
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