only one answer and explain plz Base excision repair BER Alw

only one answer and explain plz

Base excision repair (BER):

-Always involves the replacement of a single nucleotide

-Is initiated by a single group of lesion-detecting enzymes

-Addresses both single and double-stranded DNA dam

-None of these answers are correct

-Removes damaged purine nucleotides

Correct Answer : Base excision repair (BER) removes damaged purine nucleotides.

BER involves - short patch BER (where single nucleotide is replaced); long patch BER (where upto 10 nucleotides are replaced)

BER is initiated by lesion detecting enzyme that is DNA glycosylases but it has many groups according to substrate.

BER address only single straded DNA dam