What is the effect of UV light on DNA structure?

Question

give me the link! ;0

Answer 1

Damage caused by exogenous agents comes in many forms. Some examples are:

UV-B light causes crosslinking between adjacent cytosine and thymine bases creating pyrimidine dimers. This is called direct DNA damage.

UV-A light creates mostly free radicals - especially if sunscreen penetrated into the skin. The damage caused by free radicals is called indirect DNA damage.

Answer 2

dimerization of thymidine takes place by uv light

Answer 3

as mentioned by others UV light causes dimerization of thymidines in DNA   T=T   . This dimers are repaired in what is known as dark repair..but excessive dimerization /chronic and total make repair more and more difficult which can lead to mutation and misreading of DNA.