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How many prokaryotic DNA polymerases have 5’->3’ proofreading activity?(a) 1(b) 2(c) 3(d) 4I had been asked this question in a national level competition.This interesting question is from DNA Replication Prokaryotes topic in chapter DNA Replication of Cytogenetics

Answer»

The correct answer is (a) 1

Explanation: Only DNA POLYMERASE I has 5’->3’ proofreading activity. Other polymerases like POL II and III have 3’ -> 5’ proofreading activity. There are mainly 3 prokaryotic DNA polymerases.



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