Transfer RNA (tRNA) molecules play an very significant role in protein synthesis. Each tRNA becomes covalently bonded to a particular amino acid to create aminoacyl- transfer RNA that recognizes the corresponding codon in mRNA and make sure in which the correct amino acid is added to the growing polypeptide chain. The transmit RNAs are small molecules, only 74-95 nt long, that form distinctive cloverleaf secondary structures shown in the figure by internal base pairing. The stem-loops of the cloverleaf are called as arms: