use the following model of a eukaryotic transcript to answer the question. e1-4 refer to the exons, and i1-3 refer to the introns in the pre-mrna transcript. 5' utr e1 i1 e2 i2 e3 i3 e4 utr 3' suppose that exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1 (i1). which of the following results might occur? question 6 options: premature transcriptional termination loss of e1 loss of the gene product inclusion of i1 in the mrna