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Biology LibreTexts

19.3: Pre-lab Questions

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    1. What is the purpose and the advantage of Gram Staining bacteria?
    2. Name the chemical and give the purpose of each of the following in the Gram stain:
      1. Primary stain
      2. Mordant
      3. Secondary stain
    3. Color in the following diagram of bacteria (clear, pink, or purple) during the various stain steps:
    1. Draw and color a picture with Gram + cocci, Gram + rods, and Gram – rods.

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