They divide by binary fission (asexual reproduction of cells).
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1. binary fission
Replication of the circular prokaryotic chromosome beings at the origin of replication and continues in both directions at once.
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2. binary fission
The cell begins to elongate. FtsZ proteins migrate towards the midpoint of the cell.
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3. binary fission
The duplicated chromosomes move away to opposite ends of the cell. Ftsz proteins form a ring around the periphery of the midpoint between the chromosomes.
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4. binary fission
The FtsZ ring directs the formation of a septum that divides the cell. Plasma membrane and cell wall materials accumulate.
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5. binary fission
After the septum is complete, the cell pinches in two, forming two daughter cells. FtsZ is dispersed throughout the cytoplasm of the new cells.