Final answer:
The nitrogenous base is responsible for absorbing ultraviolet light.
Step-by-step explanation:
The component of the nucleotide responsible for the absorption of ultraviolet light is the nitrogenous base. Nitrogenous bases are organic molecules that contain nitrogen and form the building blocks of nucleotides. In DNA, the four nitrogenous bases are adenine (A), cytosine (C), guanine (G), and thymine (T). UV light is absorbed by the double bonds in the structure of the nitrogenous bases, causing them to fluoresce.