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.