What are Transfer RNAs (tRNAs)?

Transfer RNAs (tRNAs) are courier molecules based on RNA that transport amino acids to the corresponding positions in the polypeptide chain. These molecules (tRNAs) are fundamental components of the cellular machinery because they are in charge of deciphering the genetic code to make the specific protein chain

not sure if this is what you'r looking for eubacteria and archaebacteria