Nucleotide
Nucleoside
An organic molecule, consisting of a base (deoxyadenosine, deoxyguanosine, deoxycytidine, deoxythimidine) and a 2' deoxyribose.
If a posphatechain is added, it becomes a deoxynucleotide.
Purine
Adenine and Guanine
Pyrimidine
Cytosine and thymine