DNA nucleotides consist of three components: a sugar molecule, a phosphate group, and a nitrogenous base. The four nitrogenous bases found in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G). These bases pair up in a specific way: A always pairs with T, and C always pairs with G. Together, these base pairs form the "rungs" of the DNA ladder, which carries the genetic information in our cells