Should I Wear Sunscreen in the Winter?

The video explains how sunlight, particularly UV radiation, can damage DNA, leading to skin cancer. It describes the types of UV radiation: UVA, UVB, and UVC, and their interactions with the Earth's atmosphere and human skin. The video details how UVB radiation causes specific chemical reactions in DNA, leading to potential mutations. It also highlights the body's repair mechanisms and the importance of protecting skin from excessive UV exposure, even in winter.

What is a potential consequence of DNA damage caused by UV radiation?

• Improved eyesight

• Skin cancer

• Increased hair growth

• Stronger bones

Which type of UV radiation is primarily responsible for DNA damage?

• Infrared

• UVC

• UVB

• UVA

What are the building blocks of DNA?

• Lipids

• Bases

• Proteins

• Carbohydrates

What happens when UVB light strikes two adjacent thymine bases in DNA?

• They form a bulge

• They dissolve

• They become unlinked

• They change color

Why is it important to protect your skin from UV radiation even in winter?

• UV radiation is blocked by clouds

• UV radiation is only present in summer

• UV radiation can cause DNA damage year-round

• Winter sun is harmless