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: Biochemistry
[{'content': 'The assembly of secondary structural units into larger functional units such as the mature \npolypeptide and its component domains is \nSelect and explain. \nA. Primary structure, B. Secondary structure, C. Tertiary structure, D. Quaternary structure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The modular nature of protein synthesis and folding are embodied in the concept of orders of protein structure:\xa0\n\nPrimary structure—the sequence of amino acids in a polypeptide chain\nSecondary structure—the folding of short (3-30 residue), contiguous segments of polypeptide into geometrically ordered units.\nTertiary structure—the assembly of secondary structural units into larger functional units such as the mature polypeptide and its component domains.\nQuaternary structure—the number and types of polypeptide units of oligomeric proteins and their spatial arrangement.\n\nRef: Harper’s illustrated biochemistry. 30th edition page no: 37', 'role': 'assistant'}]