Gram positive bacteria stain _______.
purple
Gram positive bacteria stain purple or blue when subjected to the Gram staining technique. This is because they have a thick peptidoglycan layer in their cell wall which retains the crystal violet dye used in the staining process. The other steps of the staining technique involve rinsing with alcohol and counterstaining with safranin, but Gram positive bacteria retain the initial dye and appear purple or blue under the microscope. Some examples of Gram positive bacteria include Staphylococcus aureus, Streptococcus pyogenes, and Bacillus subtilis.
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