The process of DNA transcription involves transcription factors linking onto the promoter region of the DNA strand on the template strand. then the RNA polymerase is able to find the strand of DnA, and attaches to the template strand. Next, the RNA polymerase goes along the DNA strand, adding complimentary base pairs to the template strand, with U going to A. Once the RNA polymerase reaches the stop codon, the RNA polymerase releases. Then the strand of nucleotides has the introns spliced, leaving the exons to make up the strand of mRNA.