Gene Expression4. The diagram below represents regions around a gene encoding a mRNA. Exon I of the mRNAcontains the translation initiation AUG codon. Exon IV contains the UGA termination codon.The letters A through E above the diagram refer to areas of the gene and/or the primary transcriptmade from this gene.AB CDEupstreamexoniexonli-exon in.exon iv .downstream-75-25 +1 AUGUGAa. What region of the primary transcript is removed by a spliceosome?b. What region of the DNA contains the TATA box?c. Where is the poly (A) tail added to the transcript?d. Where is the 5′ cap added to the transcript?e. Are UTRs part of exons?