A method called Gram staining is used to tell what?

Answer:
Gram staining is primarily used to differential bacteria based on their cell wall structure. Bacteria are usually classified as Gram positive or Gram negative.

Gram positive - thick layer of peptidoglycan as outermost layer, plasma membrane as innermost layer.

Gram negative - thin layer of peptidoglycan "sandwiched" in between 2 separate plasma membranes.
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