Aminoacyl-tRNA synthetases exhibit all of these characteristics EXCEPT:

A) some are monomeric and others are oligomeric.
B) they attach the amino acid to the 2'- or the 3'-hydroxyl of the ribose located at the 5'-end of the tRNA.
C) they attach the amino acid to a terminal adenylate residue on the tRNA.
D) through binding specificity, they relate specific amino acids to appropriate codons.
E) they must "read" the anticodon of the tRNA.