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
Gram-positive bacteria have a thick peptidoglycan layer in their cell walls.
Their cell walls contain teichoic acids, which contribute to their rigidity and charge.
Gram-positive bacteria retain the crystal violet stain during the Gram staining process, appearing purple under a microscope.
Examples of Gram-positive bacteria include Staphylococcus and Streptococcus species.
They are generally more susceptible to antibiotics that target peptidoglycan synthesis, such as penicillin.
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Related terms
Gram-negative bacteria: Bacteria that have a thin peptidoglycan layer and an outer membrane, appearing pink or red after Gram staining.
Peptidoglycan: A polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria.
Teichoic acids: Polymers found in the cell wall of Gram-positive bacteria that contribute to its rigidity and overall charge.