Prokaryotic cells
Cell theory and overview · Biology
Animal cell explorer
Interactive 3DPeek inside an animal cell — pick an organelle to highlight it and learn its job.
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Study notes
Example: E. coli in your gut is a prokaryote. Its single circular DNA floats in the cytoplasm (nucleoid), it makes proteins on small 70S ribosomes, and it can divide every 20 minutes by binary fission — one cell splitting into two identical cells.