This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycoplasma, Subject name: Microbiology
[{'content': 'Organism lacking cell wall: \nSelect and explain. \nA. Bacillus, B. Actinomycetes, C. Chlamydiae, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: d (Mycoplasma) Ref: Ananthanarayanan, 7th ed, p. 395Mycoplasma are a group of bacteria that are devoid of cell walls and so highly pleomorphic with no size and shape.The cells are bounded by a soft trilaminar unit membrane containing sterols.Cell wall: Between capsule & cytoplasmic membrane-CELL WALL COMPONENTS Gram positiveGram negativePeptidoglycanPeptidoglycanTeichoic acidLipoproteinPolysaccharideLipopolysaccharide Peptidoglycan (mucopeptide or murien)Formed ofN acetyl glucosamine and N acetyl muramic acid.In Gram positive around 40 sheets while inGram negative only 1-2 are present.It provides tensile strength.LipopolysacchrideHas endotoxic activity; released only when cells are lysed.LipoproteinMost abundant part of Gram negative cell wallTeichoic acidMajor antigenic determinantPolymer of ribitol or glycerol', 'role': 'assistant'}]