Fidelity of protein translation depends on: (A) RNA polymeraes, (B) DNA polymeraes, (C) M-RNA polymeraes, (D) Amino acyl t-RNA synthetase
Answer is D. In translation, proof reading of mRNA is done by Amino acyl- tRNA synthetase. Amino acyl t-RNA synthetase is responsible for fidelity (faithfulness) of protein translation.