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Cell counting can be carried out by

  • A.direct microscopic count using a Petroff-Hausser counting chamber
  • B.plate counting
  • C.membrane filter count
  • D.all of the above

Answer: D

Correct answer: all of the above

All three count cells. A counting chamber gives a direct microscopic total, live and dead alike; plate counting gives the viable count only, since each colony grew from a living cell; and a membrane filter concentrates organisms from a large dilute volume before they are counted or cultured, which is how water is tested.

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