Mycoplasmas differ from chlamydiae in that they are
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.
Susceptible to penicillin
Able to grow on artificial cell-free media
Able to cause urinary tract infection
Able to stain well with Gram's stain
Bacteria