Define gram negative bacteria.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Gram-negative bacteria are prokaryotes that do not retain the crystal violet stain in the Gram staining procedure and appear pink/red after counterstaining with safranin. They possess a thin peptidoglycan layer (2–3 nm) and an outer lipopolysaccharide membrane.
Examples: E. coli, Salmonella, Vibrio cholerae
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