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Flagella move the cell by

  • A.many flagella beating in a synchronous, whip-like motion
  • B.an individual flagellum beating in a whip-like motion
  • C.spinning like a propeller
  • D.attaching to nearby particles and contracting

Answer: C

Correct answer: spinning like a propeller

The bacterial flagellum is rigid and does not beat. A rotary motor embedded in the membrane, driven by the proton-motive force, spins the helical filament like a propeller at several hundred revolutions a second. That is quite unlike the eukaryotic flagellum, which bends along its length.

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