Scenario While Working with Cultured Mouse Cells, a Researcher Unknowingly Treated

Multiple Choice

Scenario
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, the researcher isolated and cultured a single cell from this group and noticed that the progeny of this cell were not producing a certain protein, and that this affected their survival.
-The mutation that resulted from the accident was probably ________.

A) an amino acid substitution
B) one that changed the triplet grouping of the genetic message
C) an error in translation
D) a loss in regulation of gene expression