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': 'Characteristics of glycoprotein -a) Protein linked with glycosidic bondb) Core proteinc) Sugar residues are long in carbohydrate portion of glycoproteind) Participate in cell surface recognition \nSelect and explain. \nA. b, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The oligosaccharide units of a glycoprotein are covalently linked to the polypeptide by specific glycosidic bond, termed as the glycopeptide bond.\nCore protein is found in proteoglycans, not in glycoproteins.\nThe length of the oligosaccharide chain is relatively short (2-10 sugar residues) in glycoproteins, whereas it is longer (upto 100) in proteoglycans.\nGlycoproteins participate in cell surface recognition', 'role': 'assistant'}]