Which of the following bacteria has a thin cell wall hidden

Which of the following bacteria has a thin cell wall hidden in the periplasmic space?

A. Staphylococcus aureus, a G(+) coccus.

B. Escherichia coli, a G(-) bacillus.

C. Mycoplasma pneumoniae, a G(-) intracellular pathogen.

D. Mycobacterium bovis, an acid-fast bacterium.

Solution

Answer. D. Mycobacterium bovis

Between the cell wall and the inner membrane of M. bovis is present the periplasmic space. Inner to the cell wall is present a arabinogalactan – peptidoglycan (AG-PG) layer and it forms an asymmetrical outer membrane.