1. Deoxyribose sugar: A five-carbon sugar that forms the backbone of DNA.

2. Phosphate group: A negatively charged group attached to the 5' carbon of the deoxyribose sugar.

3. Nitrogenous base: One of four nitrogen-containing molecules (adenine, guanine, cytosine, or thymine) that attach to the 1' carbon of the deoxyribose sugar.

These three components combine to form a single deoxynucleotide, which then links with other deoxynucleotides to form long chains of DNA.