Agroup of very small, pleomorphic bacteria without cell walls, previously thought to be viruses, because they are capable of crossing bacterial filters.
a) mycoplasma
b) clostridia
c) anthrax
d) spirochetes

A) Mycoplasma

Explanation:

This kind of bacteria does not have a cell wall.

This is why it's so difficult to kill them with antibiotics that block cell wall synthesis like penicillin. They do not respond to them.

Atypical pneumonia and some pelvic inflammations are caused by this kind of bacteria.

do you have a picture?

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;