This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria), 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: 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', 'role': 'assistant'}]