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Microbiology

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Rickettsia and Chlamydia

Question
23 out of 42
 

Which of the following describes the difference between mycoplasmas and chlamydiae?



A Able to cause disease in humans

B Able to cause urinary tract infection

C Able to grow on artificial cell-free media

D Able to stain well with Gram stain

Ans. C Able to grow on artificial cell-free media

a. Mycoplasmas lack a rigid cell wall and are bound by a triple-layer unit membrane. For this reason, they are completely resistant to the action of penicillins. Unlike the chlamydiae, they can replicate in cell-free media.

b. Chlamydia are cultivable only on yolk sac of chick embryo or on cell lines-HeLa, McCoy which are irradiated.

Rickettsia and Chlamydia Flashcard List

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