Some Bases in the DNA Can Undergo Spontaneous Tautomeric Shifts

question 6

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.

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