Prokaryotic cells (like bacteria and archaea) are structurally simpler than eukaryotic cells. A key difference is the absence of membrane-bound organelles in prokaryotes. A) Cell wall: Many prokaryotes have a cell wall (though different in composition from eukaryotic cell walls like those in plants or fungi). B) Mitochondria: Mitochondria are membrane-bound organelles responsible for cellular respiration and ATP production in eukaryotic cells. They are not found in prokaryotic cells. In prokaryotes, respiration occurs in the cytoplasm and across the cell membrane. C) Plasma membrane: The plasma membrane (cell membrane) surrounds the cytoplasm and is present in all cells, both prokaryotic and eukaryotic. D) Ribosome: Ribosomes are responsible for protein synthesis and are found in the cytoplasm of all cells, both prokaryotic and eukaryotic (though prokaryotic ribosomes are 70S, and eukaryotic ribosomes are 80S).