UV radiation's bactericidal activity comes from:
A. the rays burning the cells.
B. it destroying the lipid layer of the cell membrane.
C. the ozone it produces.
D. the UV rays damaging the cells' DNA.
Answer: D
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a. 1, 2, and 3 b. 1 and 2 only c. 1 and 3 only d. 3 only
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