This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Peptidoglycans are found in large quantities in cell wall of the following microorganism: \nSelect and explain. \nA. Virus, B. Gram positive bacteria, C. Gram negative bacteria, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The peptidoglycan layer is much thicker in gram-positive than in gram-negative bacteria. Comparison of Cell Walls of Gram-Positive and Gram-Negative Bacteria: Component Gram-Positive Cells Gram-Negative Cells Peptidoglycan Thicker; multilayer Thinner; single layer Teichoic acids Present Absent Lipopolysaccharide (endotoxin) Absent Present Ref: Levinson W. (2012). Chapter 2. Structure of Bacterial Cells. In W. Levinson (Ed), Review of Medical Microbiology & Immunology, 12e.', 'role': 'assistant'}]