Protein synthesis is involved in gene expression. Gene expression is the process of DNA that controls protein synthesis. Genes code for certain proteins that are created by DNA transcription and translation (Reece, et al. 334). This happens by using an mRNA template to specify the order of amino acids. Protein synthesis starts on the free ribosomes within the cytosol. The signal sequence that initiates the process is located at the N-terminal end of the polypeptide chain. Different codons along the