LO33 Identify the parts of a mature mRNA Remember the image represents the DNA sequence of the troponin gene. However, you are not getting the entire DNA sequence of the troponin gene. You are seeing the 5 ' strand starting in position 1. Although the mRNA is different from the DNA, if you were to transcribe the gene as provided into RNA, what would you be missing if you compare it to an IMMATURE RNA molecule? The introns The start codon The exons The promoter The stop codon.