Question : Thymine dimer formation in DNA is caused by
Option 1: IR-rays
Option 2: X-rays
Option 3: b and g-rays
Option 4: UV-rays
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Correct Answer: UV-rays
Solution : The correct answer is UV-rays.
UV radiation is a form of electromagnetic radiation found in the sun. It has a shorter wavelength than visible light and a greater energy level. UV light can harm DNA by inducing thymine dimers to form. Thymine dimers are covalent connections formed by two neighbouring thymine nucleotides on the same DNA strand. The thymine bases absorb energy and get excited as a result of UV light. The stimulated thymine bases can then combine to create a dimer bond.
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