The axial fibrils of spirochetes most closely resemble which bacterial structure?

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Multiple Choice

The axial fibrils of spirochetes most closely resemble which bacterial structure?

Explanation:
Motility in spirochetes is driven by axial filaments that lie in the periplasmic space, between the inner and outer membranes. These filaments rotate, twisting the entire cell in a corkscrew fashion. That propulsion mechanism is functionally the same as a flagellum, so the axial fibrils resemble a flagellum more than any other structure. Pilus is primarily for attachment or DNA transfer, the cytoplasmic membrane is just the inner boundary of the cell, and a sporangium is a spore-containing structure not involved in this type of motility.

Motility in spirochetes is driven by axial filaments that lie in the periplasmic space, between the inner and outer membranes. These filaments rotate, twisting the entire cell in a corkscrew fashion. That propulsion mechanism is functionally the same as a flagellum, so the axial fibrils resemble a flagellum more than any other structure. Pilus is primarily for attachment or DNA transfer, the cytoplasmic membrane is just the inner boundary of the cell, and a sporangium is a spore-containing structure not involved in this type of motility.

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