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Question
Which of the following reactions is required for proofreading during DNA replication by DNA polymerase III?
Options:
A .  5’ to 3’ exonuclease activity
B .  3’ to 5’ exonuclease activity
C .  3’ to 5’ endonuclease activity
D .  5’ to 3’ endonuclease activity
Answer: Option B
Answer: (b).3’ to 5’ exonuclease activity

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