Multiple Choice
Some abnormal bases that are produced by DNA-damaging chemicals can be removed by base excision repair.In this repair system, the initial removal of the abnormal base is followed up by which of the following enzymes?
A) AP endonuclease.
B) Topoisomerase II.
C) The 3'-exonuclease activity of DNA polymerase I.
D) A helicase that separates the strands.
E) An exonuclease that is part of the mismatch repair system.
Correct Answer:

Verified
Correct Answer:
Verified
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