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A cell is the smallest unit capable of life functions, with animal cells possessing a nucleus and being more complex than prokaryotic cells. Prokaryotic cells lack a membrane-bound nucleus, while eukaryotic cells include animal and plant cells. Eukaryotic cells have a membrane-bound nucleus and organelles, such as mitochondria and ribosomes. Cells also contain organic molecules like proteins, carbohydrates, lipids, and nucleic acids, each serving different functions. The cell structure includes a plasma membrane, nucleus, and cytoplasm, with organelles like mitochondria and ribosomes performing essential roles.
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