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Discussion

Treponema species from human oral cavity can be selected by using

  • A.pH of the medium
  • B.incubation temperature
  • C.cell size and motility
  • D.all of these

Answer: C

Correct answer: cell size and motility

Oral treponemes are exceptionally slender and actively motile, so they pass through a membrane filter of about 0.2 μm under their own power while larger organisms are held back. Selection is therefore by physical dimensions and movement rather than by any nutrient or inhibitor.

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