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Which of the following structure(s) is /are external to cell wall?

  • A.Flagella
  • B.Stalks
  • C.Sheath
  • D.All of these

Answer: D

Correct answer: All of these

All three lie outside the cell wall: flagella for motility, stalks (prosthecae) for attachment and for increasing the absorptive surface, and sheaths, the tubes in which some filamentous bacteria live. Capsules, pili and fimbriae belong to the same external category.

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