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Question

Arrange the following steps in correct order as per Gram’s staining technique
1) Treatment with 0.5% Iodine solution
2) Counter staining with safranin
3) Treatment with absolute ethanol
4) Staining heat fixed smear with crystal violet

A
4, 1, 3, 2
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B
3, 2, 1, 4
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C
3, 1, 2, 4
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D
4, 2, 3, 1
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Solution

The correct option is A 4, 1, 3, 2
Steps in Gram's staining
  1. Applying a primary stain (crystal violet) to a heat-fixed smear of a bacterial culture.
  2. The addition of iodine, which binds to crystal violet and traps it in the cell.
  3. Rapid decolorization with ethanol
  4. Counterstaining with safranin.

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