Why RNA polymerase do not have proof reading and exonuclease activity?
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It is generally assumed that RNA pol. does not need to proofread, because RNA molecules are working copies that can tolerate a few errors (and can be replaced by new copies transcribed from the DNA). *Note: There is some evidence that some RNA polymerases do have 3' to 5' exo activity and can proofread.
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because RNA molecules are working copies that can tolerate a few errors
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