To repair a thymine dimmer by nucleotide excision repair, in which order do the necessary enzymes act?
A)exonuclease, DNA polymerase III, RNA primase
B)helicase, DNA polymerase I, DNA ligase
C)DNA ligase, nuclease, helicase
D)DNA polymerase I, DNA polymerase III, DNA ligase
E)endonuclease, DNA polymerase I, DNA ligase

Question

Quizplus · Accepted Answer

Nucleotide excision repair starts with an endonuclease that removes the damaged section of DNA. DNA polymerase I fills in the gap, and DNA ligase seals the strand back together. Therefore, the correct order of the enzymes is endonuclease, DNA polymerase I, and DNA ligase.

To Repair a Thymine Dimmer by Nucleotide Excision Repair, in Which