Which of the following types of dna damage cannot be repaired by base excision repair?
a. depurination
b. cytosine deamination
c. thymine dimer
d. single-strand break
e. base oxidation

c. Thymine dimer

Explanation:

Thymine dimer

Thymine dimer ( also called the DNA damage ) that is repaired by the nucleotide excision repair which involves the breakage of the phosphodiester bond on the side of the damage , and results in the excision of an oligolnueotide of 10-12 nucleotides in length .

But the base excision repair involves the removal of the damaged base , removal of short polynuceotide and resynthesis of this area with DNA polymerase .

it takes hundreds of years to become stable.

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