The Use of Proflavin-Induced Mutations (Like FCO)in the RII Genome

Multiple Choice

The use of proflavin-induced mutations (like FCO) in the rII genome was found to experimentally support a three-nucleotide explanation for the genetic code because:

A) an insertion mutation could be suppressed by a deletion mutation.
B) the rII genes are easier to mutate than other genes.
C) proflavin was an inexpensive mutagenic compound.
D) a gene with three insertions or three deletions could sometimes provide a functional protein.
E) the rII gene encoded a protein with exactly the correct number of amino acids,as would be explained by a three nucleotide genetic code.