NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Study for the NAPLEX exam with a comprehensive quiz featuring multiple-choice questions and in-depth explanations. Build your pharmacological knowledge and increase your chances of passing the pharmacist licensure examination!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Which of the following is a Gram Positive Rod?

Corynebacterium spp.
Legionella spp.
E. coli
Prevotella spp.

The correct answer is: Corynebacterium spp.

Corynebacterium spp. is the correct answer because it is a Gram-positive rod-shaped bacterium. Gram staining is a common technique used to differentiate bacteria into two groups based on the differences in the cell wall structure. Gram-positive bacteria retain the crystal violet stain used in the Gram staining procedure and appear purple/blue under a microscope. Corynebacterium spp. is a genus of bacteria that includes several species, such as Corynebacterium diphtheriae, that are Gram-positive rods. The other options are incorrect because Legionella spp. and E. coli are both Gram-negative bacteria, which means they do not retain the crystal violet stain and appear red/pink under a microscope after the Gram staining procedure. Prevotella spp. are anaerobic Gram-negative rods and do not fit the description of a Gram-positive rod.