All members of the Monera have prokaryotic cells Biologists today agree that prokaryotic cells are fundamentally different from eukaryotic cells. This difference is great enough that it can be used to define an entire kingdom. This kingdom comprises the bacteria. We will focus mainly on the cyanobacteria, which have more in common with higher plants than other bacteria groups. Prokaryotes are much simpler in structure than eukaryotes.
Most prokaryotes are unicellular.
Features of prokaryotic cells Prokaryotic cells have no membrane-bound organelles such as the nuclei, mitochondria, and chloroplasts that are found in eukaryotic cells. These are very different from the walls of eukaryotes, which are built mainly with polysaccharides. Peptidoglycan is a mesh-like molecule composed of changes of special sugars crosslinked together by short chains of amino acids. The LPS layer is similar in structure to the lipid bilayer of the plasma membrane. The cell wall is often surrounded by a mucilaginous capsule or sheath.