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Chemistry 23 Online
OpenStudy (anonymous):

When you are exposed to sunlight for a long time, your skin, which otherwise appears normal, gets heavily tanned. What could be the reason?

OpenStudy (anonymous):

The genes for melanin pigmentation remain turned on and prepare more melanin than usual to protect the skin from photo-damage when it is exposed to sunlight for long time. The genes for melanin pigmentation remain turned off and synthesize more melanin than usual to protect the skin from photo-damage when it exposed to sunlight for a long time. The genes for melanin pigmentation are switched off to stop the synthesis of melanin to protect the skin from photo-damage when it is exposed to sunlight for a long time.

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