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key term - Gram positive

Definition

Gram-positive bacteria are a group of bacteria that have a thick peptidoglycan layer in their cell walls, which retains the crystal violet stain used in the Gram staining procedure. They appear purple under a microscope after Gram staining.

5 Must Know Facts For Your Next Test

  1. Gram-positive bacteria have a thick peptidoglycan layer in their cell walls.
  2. Their cell walls contain teichoic acids, which contribute to their rigidity and charge.
  3. Gram-positive bacteria retain the crystal violet stain during the Gram staining process, appearing purple under a microscope.
  4. Examples of Gram-positive bacteria include Staphylococcus and Streptococcus species.
  5. They are generally more susceptible to antibiotics that target peptidoglycan synthesis, such as penicillin.

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