Summary
UV light can damage DNA, but cells repair much of it with dedicated mechanisms. Without these systems, mutation load would build fast and life would struggle to persist.
Sunlight supports life, but it can also harm genetic material. The solution is the cell invisible maintenance crew.
UV rays can create bond problems and mismatches in DNA. Proteins detect the damage and replace faulty segments.
Repair is not only fixing, it is also a safety system that reduces cancer risk. Daily damage stays manageable because of it.
Life is not only growth, it is constant upkeep. DNA repair is one of biology most vital quiet defenses.
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