Ultraviolet photons harm the DNA molecules of living organisms in different ways. In one common damage event, adjacent Thymine bases bond with each other, instead of across the ladder. This makes a bulge, and the distorted DNA molecule does not function properly.

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Ultraviolet photons harm the DNA molecules of living organisms in different ways. In one common damage event, adjacent Thymine bases bond with each other, instead of across the ladder. This makes a bulge, and the distorted DNA molecule does not function properly.