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Genome and Chromosome: Prokaryotic vs. Eukaryotic

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A genome is a cell's complete DNA; a prokaryote packages it as one circular chromosome in a nucleoid, while a eukaryote packages it as linear chromosomes in a nucleus.

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A bacterium carries one circular chromosome and sometimes plasmids; a human cell carries 46 linear chromosomes.

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A prokaryote's chromosome is not a simpler eukaryotic one — they differ in shape and number.