This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
[{'content': 'Most appropriate action of ubiquiting includes \nSelect and explain. \nA. Electron transpo chain, B. Degradation of proteins, C. Synthesis of protein, D. Oxydative deamination', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Proteins are marked for degradation by the attachment of ubiquitin to the amino group of the side chain of a lysine residue. Additional ubiquitins are then added to form a multiubiquitin chain. Such polyubiquinatedproteins are recognized and degraded by a large, multisubunit protease complex, called the proteasome', 'role': 'assistant'}]