In base excision repair, which enzyme(s) cleave(s) the glycosidic bond of the altered nucleotide?Group of answer choicesDNA glycosylaseAP endonucleaseDNA polymeraseDNA ligaseall of the above

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

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 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 type of enzyme catalyses the synthesis of DNA?Group of answer choicesDNA polymerasePrimaseHelicaseDNA ligase PreviousNext

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