Structure of a Eukaryotic Cell
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A eukaryotic cell adds a membrane-bound nucleus, numerous membrane-bound organelles, and several linear chromosomes to the four components every cell shares.
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An animal cell's DNA sits enclosed by a nuclear membrane, while mitochondria and other organelles divide up its remaining work.
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Compartmentalizing functions into organelles answers Bio 0253's size limit — not a coincidence of eukaryotic complexity.