Suppose that exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1 (i₁). what might occur?
a. loss of the gene product
b. loss of e₁
c. premature stop to the mrna
d. inclusion of i1 in the mrna
e. exclusion of e2

d. inclusion of I1 in the mRNA

Explanation:

Introns are any nucleotide sequence within the gene that is non-coding and it is usually removed  by RNA splicing.

When an RNA transcript is made, it is considered as pre-mRNA. The pre-RNA  contains both the introns and the exons. For it to mature into mRNA, the introns should be spliced and the exons are joined together to form the mRNA.

A mutation might result to the intron I1 not getting spliced hence it will be included in the mRNA.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme