Firstly, you have tRNA which has a complementary amino acid sequence (anticodon) to the mRNA chain (codon), the latter is derived from dsDNA. tRNA brings specific amino acids to the mRNA in sites of protein synthesis called ribosomes. As a new tRNA molecule enters the ribosome, polymerisation reactions occur between the associated amino acids of adjacent tRNAs, whiles expelling the remaining tRNA in which its amino acid has already been added to the chain. This process repeates itself and results in the formation of new protein, which goes on to fold into specific shapes under specific physiological conditions in order to achieve activity.