Gram Stain

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Gram Stain

Most bacteria can be separated into two groups based on cell wall composition using a differential staining technique called Gram Stain. The results of this process stain gram-positive bacteria purple and gram-negative bacteria red for further analysis. You will complete a simple gram stain procedure in this activity and study the results.


Upon completion of this exercise, you will be able to:

  1. Describe the equipment used in the gram stain process
  2. Explain the concepts of gram stain
  3. List the basic steps in the gram stain process
  4. Complete a basic gram stain procedure