Final answer:
The component not found in DNA nucleotides is RNA; the nucleotides of DNA consist of a nitrogenous base (A, T, C, or G), a phosphate group, and a deoxyribose sugar.
Step-by-step explanation:
The student has asked a question about the components of DNA nucleotides. The components include a nitrogenous base, a phosphate group, and a deoxyribose sugar as its backbone. A DNA nucleotide may contain adenine (A), guanine (G), cytosine (C), or thymine (T) as a base.
The correct answer to the student's question is that RNA is not a component of DNA's nucleotides. Thymine is indeed a component of DNA, while uracil is the base found in RNA nucleotides, replacing thymine.