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Discussion

Fixation of the smear is necessary for

  • A.to kill the bacteria
  • B.for preventing bacteria washing off during staining
  • C.for best staining
  • D.all of the above

Answer: D

Correct answer: all of the above

Fixing serves all three purposes: it kills the organisms, making the slide safe to handle; it makes them stick to the glass so they are not washed off during staining; and it alters the cells so that they take up the dye more readily.

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