<prompt> Prokaryotes are characterized by:Absence of nuclear membranePresence of microvilli on its surfacePresence of smooth endoplasmic reticulumAll of the above  <response>: Ans. is a i.e., Absence of nuclear membraneRef: Ananthanarayan, 9the, p. 10 and 8the, p. 10, 13ProkaryotesEukaryotesNuclear membrane absentNuclear membrane well definedCytoplasmic structures absent, e.g., Mitochondria, Lysosomes, Golgi apparatus, and endoplasmic reticulum are absent.All these cell organelles are presentIn cell wall muramic acid and diaminopimelic acids DAPA presentBoth absent in cell wallNo sterols in cell membraneSterols present in cell membraneE.g.: Bacteria, blue-green algaeFungi, protozoa, slime mouldsSite of respiration - MesosomesMitochondria 