Proofreading activity and low replication fidelity in vitro , distributive manner in dna synthesis , poor ability to discriminate nucleotides at the level of binding and also the possibility of its expanded roles in long patch ber , ner , dna replication and recombination at its excess state Lp表現(xiàn)出很低的dna復(fù)制保真度:它沒有3 ’一5 ’外切酶活性因而在a復(fù)制中缺乏校讀活性:對底物dn p鑒別能力低卜在長單鏈模權(quán)上催化dna復(fù)制時散布式的合成方式。