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.

The Base Excision Repair (BER) pathway of DNA repair is a critical mechanism that corrects small, non-helix-distorting base lesions from the genome. Here's a step-by-step description:

1. It begins with a DNA glycosylase enzyme, which recognizes and removes the specific damaged or inappropriate base, creating an apurinic/apyrimidinic site (AP site). This is a correct statement, so "It starts with DNA glycosylase cutting the DNA backbone" is accurate.

2. An AP endonuclease then cuts the phosphodiester bond in the DNA backbone at the AP site.

3. The gap left by the removed base is then filled in by a DNA polymerase, which adds the correct nucleotide.

4. Finally, a DNA ligase seals the nick in the backbone, completing the repair.

So, the statement "It can repair the DNA without cutting the phosphate backbone" is not accurate because the phosphate backbone is indeed cut during the process.

The BER pathway is primarily responsible for repairing small lesions and not large ones like thymine dimers. Therefore, the statement "It is the main pathway for repairing large lesions like thymine dimers" is not accurate.

Lastly, the statement "It can be used to repair missing bases or damaged bases" is accurate because the BER pathway is indeed used to repair damaged or inappropriate bases in the DNA.