Found in animal secretions, e.g. tears, saliva, mucous membranes. Challenge Question Spheroplasts, Protoplasts L- forms, and Mycoplasmas Lysozyme and penicillin can lead to cells without walls. Still able to live if isotonic, but will lyse if put in hypotonic environment. Names like M. orales, M. genitalium, M. pneumoniae. Can be protein, glycoprotein, or polysaccharide.
All archaeal walls are resistant to lysozyme.
However, certain groups of prokaryotes turned out do differ profoundly from the rest. We now recognize that the Archea are taxonomically as different from Bacteria as either are from eukaryotes, which collectively are called Eukarya . Archaeal walls differ widely, and are made from different materials. Walls of methanogens often contain pseudopeptidoglycan, similar to peptidoglycan, but with slightly different sugars and archictecture. Other archaea use polysaccharides, proteins, or glycoproteins as wall materials.