Read the following scenario to answer the following question(s).while working with cultured mouse cells, a researcher unknowingly treated the cells with a mutagen that causes the deletion or insertion of individual nucleotides in dna. subsequently, she isolated and cultured a single cell from this group. she noticed that the progeny of this cell were not producing a certain protein and that this affected their survival. the mutation would be most harmful to the cells if it resulted in ) substitution of a base pairb) deletion of a triplet near the middle of the genec) a single nucleotide deletion near the end of the coding sequenced) a single nucleotide in the middle of an introne) a single nucleotide insertion near the start of the coding sequence