Which of the following is NOT considered a gram negative bacteria?

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Study for the NBEO Microbiology exam. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

Which of the following is NOT considered a gram negative bacteria?

Explanation:
Gram staining hinges on cell wall structure. Gram-positive bacteria have a thick peptidoglycan layer that traps crystal violet and they appear purple, while Gram-negative bacteria have a thinner peptidoglycan layer plus an outer membrane and take up the counterstain, appearing pink. Corynebacterium diphtheriae is a Gram-positive rod, so it does not belong to the Gram-negative group. The other organisms listed—Klebsiella pneumoniae, Proteus mirabilis, and Bordetella pertussis—are all Gram-negative bacteria, so they fit the Gram-negative category.

Gram staining hinges on cell wall structure. Gram-positive bacteria have a thick peptidoglycan layer that traps crystal violet and they appear purple, while Gram-negative bacteria have a thinner peptidoglycan layer plus an outer membrane and take up the counterstain, appearing pink.

Corynebacterium diphtheriae is a Gram-positive rod, so it does not belong to the Gram-negative group. The other organisms listed—Klebsiella pneumoniae, Proteus mirabilis, and Bordetella pertussis—are all Gram-negative bacteria, so they fit the Gram-negative category.

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