Solution to PS 8 #5
Ultravioloet (UV) light can damage DNA by causing dimerization of
thymidylate residues. One mechanism for repairing thymine dimers
is enzymatic photoreactivation, catalyzed by DNA photolase. This
enzyme uses energy from visible light to cleave the dimer and repair DNA.
Thus cells that are exposed to visible light following UV irradation are
better able to repair DNA than cells kept in the dark.
Return to Problem Set #8