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Gram’s staining consist of

  • A.2 stages 
  • B.4 stages
  • C.3 stages 
  • D.5 stages

Answer: B

Correct answer: 4 stages

The Gram stain has four steps: the primary stain (crystal violet), the mordant (iodine), decolourisation with alcohol or acetone, and the counterstain (safranin). The third is the critical one - too long, and even gram-positive cells lose the dye.

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