5Which activity of DNA polymerase I is also called "proofreading" activity?(A) 5' to 3' polymerase activity (B) 3' to 5' polymerase activity(C) 5' to 3' exonuclease activity (D) 3' to 5' exonuclease activity

11. Which description is false?(A) X-rays are hazardous because they cause DNA double-strand breaks, which are hard to repair.(B) an A to.G mutation is called a point mutation.(C) Human cells are used in the Ames test to determine the carcinogenic effects of chemicals.(D) Non-homologous end joining usually results in DNA mutations.

5Which activity of DNA polymerase I is also called "proofreading" activity?
(A) 5' to 3' polymerase activity
(B) 3' to 5' polymerase activity
(C) 5' to 3' exonuclease activity
(D) 3' to 5' exonuclease activity

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