Label the steps for protein synthesis in order, beginning with the first step. Once the protein is made, the gene for a particular trait is expressed. mRNA joins the ribosome, and the anticodons from tRNA join mRNA to form a chain of amino acids. RNA polymerase unzips DNA and free RNA nucleotides join DNA to form mRNA. A chain of amino acids is formed from peptide bonds, creating a protein. mRNA is transported from the nucleus of the cell to the ribosomes of the cell.