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多选题
DNA polymerase I has(  )。
A

3′→5′exonuclease activity

B

5′→3′exonuclease activity

C

proofreading activity

D

polymerase activity


参考答案

参考解析
解析:
DNA聚合酶Ⅰ主要是对复制中的错误进行校读,对复制和修复中出现的空隙进行填补。该酶既是复制酶又是修复酶,有模板依赖性,有5′→3′聚合酶活性,也有3′→5′外切酶活性。
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