Final answer:
Peptidyl transferase is an RNA-based ribosomal enzyme in the 50S subunit that catalyzes peptide bond formation, thus making all the provided statements about it true.
Step-by-step explanation:
The statement about peptidyl transferase that is TRUE is d) All of these choices are correct. Peptidyl transferase is an RNA-based enzyme that is part of the 50S ribosomal subunit and is responsible for catalyzing the formation of peptide bonds during protein synthesis. Specifically, peptidyl transferase catalyzes the formation of a peptide linkage between the carboxyl group of one amino acid and the amino group of another, extending the polypeptide chain one amino acid at a time as the ribosome moves along the mRNA molecule.