This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Prokaryotes are characterized by: \nSelect and explain. \nA. Absence of nuclear membrane, B. Presence of microvilli on its surface, C. Presence of smooth endoplasmic reticulum, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Absence of nuclear membrane(Ref: Ananthanarayan, 9th/e, p. 10 and 8th/e, p. 10, 13)ProkaryotesEukaryotesNuclear 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", 'role': 'assistant'}]