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Bacteria? Prokaryotic cells are divided into two groups based on nucleic and base sequences differences. Because theses two groups are so biochemically different they have been place in separate domains. Domain Bacteria and Domain Archaea. Bacteria visually: A rod-shaped bacterium is called bacillus and a spherical shape bacterium is called coccus and both can be in pairs or chains and, cocci can occur in clusters. Some long rods are twisted into spirals, others called spirilla if rigid or spirochetes if they are flexible.

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16y ago

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