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': 'Ribosomes has following enzymatic activity? \nSelect and explain. \nA. Peptidyl transferase, B. Peptidase, C. Aminoacyl tRNA synthetase, D. GTPase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The formation of peptide bonds is catalysed by peptidyl transferase, an activity intrinsic to the 23 S r-RNA of 50 S subunit in prokaryotes and 28 S r-RNA of 60 S subunit in eukaryotes. So, it is referred to as ribozyme & indicates a direct role of r-RNA in protein synthesis.', 'role': 'assistant'}]