(Answered) The accuracy of dna polymerase activity is subject to a

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The accuracy of DNA polymerase activity is subject to a 3′ exonucleolytic proofreading step. Which of the following statements is true?

The polymerase and exonuclease site are physically close to each other.
The 3′ exonuclease has very high specificity for mismatched pairs.
The K M for DNA polymerase for chain extension from a mismatch is about 3 orders of magnitude higher, allowing the mismatch to reach the exonuclease site.
All of the listed statements are true.

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