The molecular effect of ultraviolet light is | vedclass

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(C) Ultraviolet $(UV)$ radiation,particularly $UV-B$,has a high energy level that can be absorbed by the nitrogenous bases of $DNA$. When $DNA$ is exp

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Formation of pyrimidine dimers

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(C) Ultraviolet $(UV)$ radiation,particularly $UV-B$,has a high energy level that can be absorbed by the nitrogenous bases of $DNA$. When $DNA$ is exposed to $UV$ light,it causes the formation of covalent bonds between adjacent pyrimidine bases (specifically thymine or cytosine) on the same strand. This process is known as the formation of pyrimidine dimers. These dimers distort the $DNA$ helix,which can lead to errors during $DNA$ replication and transcription,potentially causing mutations or cell death.

The molecular effect of ultraviolet light is primarily mediated by:

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