NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Which bacteria forms pairs and chains and is a Gram Positive Cocci?

  1. Strep. pneumoniae

  2. E. coli

  3. Providencia spp.

  4. Bacteroides fragilis

The correct answer is: Strep. pneumoniae

Strep. pneumoniae is the bacteria that forms pairs and chains. It is also a Gram positive cocci, meaning it has a spherical shape and retains the crystal violet stain in the Gram stain test. The other options are incorrect because - E. coli is a Gram negative rod-shaped bacteria that typically forms colonies, not pairs or chains. - Providencia spp. is a Gram negative bacteria that can be either rod-shaped or spherical, but it does not typically form pairs or chains. - Bacteroides fragilis is a Gram negative, rod-shaped bacteria that forms clusters, not pairs or chains.

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