Why do we have so many error-prone DNA polymerases in our cells?

Accession number;01A0145789
Title;Why do we have so many error-prone DNA polymerases in our cells?
Author; OHMORI H (Kyoto Univ.)
Journal Title;Nippon Bunshi Seibutsu Gakkai Nenkai Puroguramu, Koen Yoshishu
Journal Code:L1278A
ISSN:
VOL.23rd;NO.;PAGE.232(2000)
Figure&Table&Reference;
Pub. Country;Japan
Language;English
Abstract;