Which of the four DNA repair systems described in this subject is specific to E coli?Group of answer choicesBase excision repairNucleotide excision repairDirect repairMismatch repair

In nucleotide-excision repair, the first enzyme to act is: Group of answer choices excinuclease DNA ligase DNA polymerase I DNA helicase

Which of these DNA repair mechanisms is most likely to result in mutation?Group of answer choicesBase excision repair.Non-homologous end-joining.Mismatch repair.Nucleotide excision repair.

Which is true about base excision repair:Group of answer choicesIt can repair pyrimidine dimers.DNA polymerase I replaces the short row of nucleotides using its 3’ to 5’ exonuclease activity.In E. coli, it repairs a mismatch in a newly synthesised DNA strand.DNA ligase is required to repair the nick formed by DNA polymerase I

Which accurately describes the Base excision repair pathway of DNA repair?Group of answer choicesIt starts with DNA glycosylase cutting the DNA backbone. It can repair the DNA without cutting the phosphate backboneIt is the main pathway for repairing large lesions like thymine dimers.It can be used to repair missing bases or damaged bases.

Which repair pathway would be used to repair a cytosine that has been turned into a uracil Group of answer choices nucleotide excision repair Base excision repair None of them. Uracil is a normal base so this is not a problem Mismatch repair