Additions or deletions of bases in the nucleotide sequence of a structural gene most often result in
(a) an altered sequence of amino acids in the protein that the gene encodes
(b) insertion of a new intron into the coding sequence of the gene
(c) decreased histone binding
(d) decreased excision repair
(e) increased levels of mrna production

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except