 The process of <unk> a protein from an mRNA template is known as translation . The mRNA is loaded onto the ribosome and is read three <unk> at a time by matching each codon to its base pairing <unk> located on a transfer RNA molecule , which carries the amino acid corresponding to the codon it recognizes . The enzyme <unk> tRNA <unk> " charges " the tRNA molecules with the correct amino acids . The growing polypeptide is often termed the nascent chain . Proteins are always <unk> from N @-@ terminus to C @-@ terminus . 
