Some Bases in the DNA Can Undergo Spontaneous Tautomeric Shifts

Multiple Choice

Some bases in the DNA can undergo spontaneous tautomeric shifts, forming chemical structures with unusual base-pairing properties.At what point is the presence of a tautomeric shift most likely to cause a mutation?

A) During addition of a phosphate to a ribonucleoside.
B) During a visit to the beach with a lot of sunlight.
C) In a person suffering from Cockayne syndrome.
D) During addition of bases to a replicating DNA strand.
E) During the excision part of nucleotide excision repair.