The main damaging effect of UV radiation on DNA is:Select one:a. Dehydrationb. Depurinationc. Formation of thymine dimersd. Single-stranded breaks
Question
The main damaging effect of UV radiation on DNA is:
Select one:
- a. Dehydration
- b. Depurination
- c. Formation of thymine dimers
- d. Single-stranded breaks
Solution
The main damaging effect of UV radiation on DNA is:
c. Formation of thymine dimers
Here's why:
Ultraviolet (UV) radiation, particularly the shorter wavelength UVB, is absorbed by the DNA molecule and can cause damage to it. The most common damage caused by UV radiation is the formation of thymine dimers. Thymine dimers are formed when two adjacent thymine bases on a DNA strand bond together, or dimerize, distorting the DNA molecule and interfering with its replication and transcription. This can lead to mutations, which can result in skin cancer and other harmful effects.
Dehydration, depurination, and single-stranded breaks can also occur due to other types of DNA damage, but they are not the main damaging effects of UV radiation.
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