Some Abnormal Bases That Are Produced by DNA-Damaging Chemicals Can

question 8

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.

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