Which organism is a gram-negative bacillus among the listed choices?

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Prepare for the Clinical Laboratory Science Microbiology Test with engaging content and multiple choice questions. Each question is accompanied by hints and detailed explanations to enhance your learning experience and boost your confidence for the examination!

Multiple Choice

Which organism is a gram-negative bacillus among the listed choices?

Explanation:
Gram-negative bacilli have a thin peptidoglycan layer and an outer membrane, which makes them stain pink with the Gram stain. Porphyromonas species are Gram-negative, anaerobic, non-spore-forming rods that are common in the oral cavity and associated with periodontal disease. This combination—Gram-negative and rod-shaped—fits the description, making Porphyromonas spp the correct choice. The other organisms listed are Gram-positive anaerobic rods (Eubacterium lentum, Propionibacterium acnes, and Bifidobacterium dentium), so they do not match the Gram-negative bacillus criterion.

Gram-negative bacilli have a thin peptidoglycan layer and an outer membrane, which makes them stain pink with the Gram stain. Porphyromonas species are Gram-negative, anaerobic, non-spore-forming rods that are common in the oral cavity and associated with periodontal disease. This combination—Gram-negative and rod-shaped—fits the description, making Porphyromonas spp the correct choice. The other organisms listed are Gram-positive anaerobic rods (Eubacterium lentum, Propionibacterium acnes, and Bifidobacterium dentium), so they do not match the Gram-negative bacillus criterion.

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