• Prokaryotic cells are distinguished by their shape.
  • The most common shapes are helices, spheres, and rods.
  • Prokaryotes also have long, thin protein structures called flagella (singular, flagellum) They extend from the plasma membrane.
  • Flagella may be located at one or both ends of the cell or all around it.
  • They help prokaryote move toward food or away from toxins.
  • Many organisms form spores for reproduction.
  • Called endospores, they form inside prokaries when they are under stress.
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