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Which among the following are “Spirochetes”?

  • A.Spirillum volutans
  • B.Corynebacterium diphtheriae
  • C.Streptomyces sp.
  • D.Treponema pallidum

Answer: D

Correct answer: Treponema pallidum

Treponema pallidum, the agent of syphilis, is a spirochaete: a slender flexible helix moved by axial filaments that run inside the outer sheath rather than outside the cell. Spirillum is a rigid spiral with external flagella, which is a different group altogether.

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