<prompt> Prokaryotes are characterized by -Absence of nuclear membranePresence of microvilli on its surfacePresence of smooth endoplasmic reticulumAll of the above  <response>: Different between Prokaryotes and Eukaryotes PROKARYOTES EUKARYOTES Nuclear membrane absent Nuclear membrane well defined Cytoplasmic structures absent e.g. Mitochondria, Lysosomes, Golgi apparatus, and endoplasmic reticulum are absent. All these cell organelles are present In cell wall muramic acid diaminopimelic acids DAPA present Both absent in cell wall No sterols in cell membrane Sterols present in cell membrane Eg-bacteria, blue-green algae Fungi, protozoa, slime moulds Site of respiration - Mesosomes Mitochondria Ribosomes--protein production site - 70S 50S 30S, free in cytoplasm or bound to cell membrane Ribosomes--protein production site - 80S 60S 40S, attached to rough endoplasmic reticulum 