esizing a strand of complementary to the undamaged strand (Nester, 2004). However at times, when the environmental change is too rapid or of long duration, the organism is unable to keep up with the change and the cell will die. Ultimately, the more UV exposure the greater number of mutations and the cell is unable to repair the damage.
             The purpose of this laboratory experiment was to determine the amount of ultraviolet light exposure P. fluorescens and B. subtilis could tolerate and still continue to grow. B. subtilis is characterized by
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