Question

How is the molecular action of the ultraviolet ray reflected?

1. Photosynthesis Action affected in plants
2. Formation of pyrimidine
3. Formation of sticky metaphase
4. Destruction of hydrogen bond in DNA

Answer 1

Correct Answer - Option 4 : Destruction of hydrogen bond in DNA

• The best known acute effect of excessive UV exposure is erythema, the familiar skin reddening termed as sunburn.
• Chronic exposure to UV radiation also causes a number of degenerative changes in the cells, fibrous tissue and blood vessels of the skin.
• UV rays are highly injurious to living organisms since DNA and proteins of living organisms preferentially absorb UV rays, and it's high energy breaks the chemical bonds of hydrogen within the DNA molecules.