This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
RNA with Enzymatic activity is 
Select and explain. 
A. Peptidase, B. Peptidyl transferase, C. Cytidine deaminase, D. Aminoacyl tRNASynthetase
B: Peptidyl transferase
Answer: B: Peptidyl transferase 
Explanation: Interestingly, some RNA molecules have intrinsic catalytic activity. The activity of these RNA enzymes, or ribozymes, often involves the cleavage of a nucleic acid. Two ribozymes are the peptidyl transferase that catalyzes peptide bond formation on the ribosome, and ribozymes involved in the RNA splicing.Ref: Harper&;s; 30th edition; Page no: 363