E.coli DNA repair enzymes act on the sequence.Which of the following will result?

Question

Quizplus · Accepted Answer

E.coli DNA repair enzymes recognize and correct DNA damage such as mismatches and bases that have undergone spontaneous oxidation or deamination. One type of repair enzyme, called a methyltransferase, can add a methyl group to the G base, which often prevents it from pairing with a T. However, this option is not mentioned in the question. Therefore, the most likely result is that the underlined G will be changed to a T, which is a common type of DNA repair called mismatch repair. Option A is not likely because it involves changing a base that is not mentioned as being damaged in the question, and options C and D are less likely because they involve adding a methyl group rather than correcting a damaged base. Option E is incorrect because there is only one correct answer.

EColi DNA Repair Enzymes Act on the Sequence