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The structure responsible for motility of bacteria is

  • A.pili
  • B.flagella
  • C.sheath
  • D.capsules

Answer: B

Correct answer: flagella

Flagella drive swimming: a rotary motor in the membrane spins the helical filament like a propeller. Pili and fimbriae are for attachment and for conjugation, capsules for protection, and sheaths are structural.

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