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* השאלה נוספה בתאריך: 28-01-2021

		1. cleaving Okazaki fragments
		2. Excision of thymidine dimers
		3. Elongation of DNA strands
		4. Removal of RNA primer sequences in the lagging strand
		5. Removing mismatched nucleotides

(USMLoid) Which of the following is the major role of the 3'->5' exonuclease activity of DNA polymerases?