I feel that it means that Kornbergs enzyme is not necessary for growth!!

John Cairns mutant is sensitive to UV light and mutation damage, because it has no repair enzyme.

In fact there are multiple Enzymes.

Text iGenetics by Peter J. Russell

This web site is provided for instruction in Botany and Zoology 342

by Kenneth G. Wilson,
Professor of Botany
Miami University
wilsonkg@muohio.edu