Biology 207 - Practice questions 4 - Mutations
Question 1 The A-gene makes a pre-mRNA with one intron. Make a diagram showing how
the pre-mRNA is processed normally and what might happen if there is a mutation in the
Question 2 Recall that EMS causes GC-->AT bp substitutions. Consult a genetic codon
table to answer this question.
a) Can EMS cause nonsense mutations? Use a diagram to show why or why not.
b) Can EMS revert nonsense mutations? Use a diagram to show why or why not.
Question 3 The lacI gene in E.coli has mutational hot spots. Hot spots are sites in a gene
that are much more mutable than other sites.