Which of the Following Mutagens Does NOT Cause Point Mutations

Question

Which of the following mutagens does NOT cause point mutations?
A) caffeine
B) 5-bromouracil
C) nitrosoguanidine
D) nitrites
E) acridine dyes

Accepted Answer

Acridine dyes cause frameshift mutations, not point mutations. They insert or delete a base pair, which shifts the reading frame of the genetic code, rather than altering a single nucleotide.