A Gram stain of a tissue sample from a patient shows Gram-negative spheres that can barely be resolved on the best light microscope. A transmission electron micrograph reveals the spheres have a double membrane but no cell wall. The intracellular parasites are likely to be a
A) Listeria.
B) Mycoplasma.
C) Coxiella.
D) Chlamydia.
E) Rickettsia.

Question

Quizplus · Accepted Answer

Chlamydia are Gram-negative bacteria that lack a peptidoglycan cell wall and are obligate intracellular parasites, fitting the description given.

A Gram Stain of a Tissue Sample from a Patient