Final answer:
Peptidyl transferase catalyzes the formation of peptide bonds and is present in the 50S ribosomal subunits.
Step-by-step explanation:
Peptidyl transferase is an RNA-based enzyme that is integrated into the 50S ribosomal subunit and catalyzes the formation of peptide bonds. It is responsible for linking amino acids together to form a polypeptide chain during protein synthesis. Therefore, the correct statement about peptidyl transferase is that it catalyzes the formation of peptide bonds and it is present in the 50S ribosomal subunits.