The basic unit of DNA that is made up of a phosphate group, a sugar (deoxyribose), and a nitrogenous base is called a nucleotide.

Here's a breakdown:

* Phosphate group: A negatively charged molecule that provides the backbone structure of DNA.

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

* Nitrogenous base: One of four molecules (adenine, guanine, cytosine, or thymine) that carry the genetic information.

These three components are linked together to form a single nucleotide, which is the basic building block of DNA.