Salmonella is which type of bacteria?

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Multiple Choice

Salmonella is which type of bacteria?

Explanation:
Understanding how Gram staining works helps here. Salmonella has a thin peptidoglycan layer plus an outer membrane with lipopolysaccharide, which is the hallmark of Gram-negative bacteria. During staining, the crystal violet-iodine complex is washed out by alcohol in these organisms, and the cells take up the pink counterstain. That pink appearance classifies Salmonella as Gram-negative. It isn’t acid-fast, because acid-fast bacteria have waxy mycolic acids in their cell walls that resist decolorization and require a different stain. It’s also not Gram-variable, since Salmonella consistently shows a Gram-negative result.

Understanding how Gram staining works helps here. Salmonella has a thin peptidoglycan layer plus an outer membrane with lipopolysaccharide, which is the hallmark of Gram-negative bacteria. During staining, the crystal violet-iodine complex is washed out by alcohol in these organisms, and the cells take up the pink counterstain. That pink appearance classifies Salmonella as Gram-negative. It isn’t acid-fast, because acid-fast bacteria have waxy mycolic acids in their cell walls that resist decolorization and require a different stain. It’s also not Gram-variable, since Salmonella consistently shows a Gram-negative result.

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