Effect of UV Light on Cell Viability

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7 Terms

1
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In what specific way does ultraviolet light destroy microorganisms

Forms thymine dimers between 2 thymine bases

2
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What adverse effect can result from overexposure of human tissues to UV light

Skin cancer

3
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What type of light is injurous to nonphotosynthetic bacteria

short, invisible UV wavelengths

4
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What is the spectrum for UV light

100-400nm

5
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What is the most effective germicidal region of the UV spectrum

240-300nm

6
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What is photo reactivation

a light-dependent process that uses (PRE) to break the bonds between the dimer and returns the damaged DNA strand to its original state

7
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What is dark repair

nuclease enzymes hydrolyze the phosphodiester bonds at either end of the damaged region of the DNA strand and remove the damaged portion