Question: why are mrna and trna necessary for the synthesis of polypeptides?
Answer: Messenger RNA (mRNA) is translated into protein by the joint action of transfer RNA (tRNA) and the ribosome, which is composed of numerous proteins and two major ribosomal RNA (rRNA) molecules. [Adapted from (more...) 1. ... They also bind tRNAs and various accessory molecules necessary for protein synthesis.