This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology, Subject name: Biochemistry
[{'content': 'Enzymatic activity of RNA is involved in all of the following EXCEPT \nSelect and explain. \nA. RNA-Aptamer binding to cognate small molecules, B. Cleavage of nucleic acids, C. Peptide bond formation, D. RNA splicing', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ribozymes Present in some RNA molecules Have intrinsic catalytic activity Involve the cleavage of a nucleic acid Two ribozymes are the peptidyl transferase that catalyzes peptide bond formation on the ribosome Involved in the RNA splicing. Aptamers are oligonucleotide or peptide molecules that bind to a specific target molecule.', 'role': 'assistant'}]