Final answer:
Purine nucleosides are named by the base and sugar present in them, as they form a nucleoside through an N-glycosyl linkage. The purine bases, which have a double ring structure, are linked through the nitrogen.
Step-by-step explanation:
Purine nucleosides are named by the base and sugar present in them. A nucleoside is formed by linking the nitrogenous base to the -OH group at the first carbon of the pentose sugar through an N-glycosyl linkage. The purine bases, which have a double ring structure, are linked through the nitrogen.