The enzyme that copies DNA makes a mistake approximately every 10,000 to 100,000 bases.Surprisingly,however,if we examine newly copied DNA,we see that the actual error rate is lower than this.How is that possible?

Question

Quizplus · Accepted Answer

There are other enzymes, such as DNA polymerase proofreading and mismatch repair mechanisms, that recognize and correct errors in the copied DNA. These mechanisms help to reduce the actual error rate to lower than the expected rate. Choices A and B are incorrect as self-correction of bases and immediate cell death for errors are not the primary mechanisms for reducing error rates. Choice D is incorrect as self-correction and immediate cell death do not occur and are not necessary for the function of the repair enzymes. Choice E is incorrect as C is the correct answer.

The Enzyme That Copies DNA Makes a Mistake Approximately Every