This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'The cytoplasmic membrane of bacteria is responsible for - \nSelect and explain. \nA. Slective permeability, B. Motility, C. Cell division, D. Conjunction', 'role': 'user'}, {'content': "Answer: A \nExplanation: The cytoplasmic membrane is a thin layer lining the inner surface of the cell wall and separating it from the cytoplasm. It acts as a semipermeable membrane controlling the flow of metabolites to and from the protoplasm. Passage through the membrane is not solely a function of the molecular size of the paicles but depends in many cases on the presence in the membrane of specific enzymes (pereases). Electron microscopy shows the presence of 3 layers constituting a unit membrane structure. Chemically the membrane consists of lipoprotein with a small number of carbohydrates. Sterols are absent except in mycoplasma Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 16", 'role': 'assistant'}]