Identify the given structure.

Nitrogen bases: adenine, guanine, cytosine, uracil, and thymine. When found attached to a sugar, they are called nucleosides.

Nucleosides:  If a phosphate group is also found esterified to the sugar they are called nucleotides ,Adenosine, guanosine, thymidine, uridine and  cytidine are nucleosides. 

Nucleotides: (Nucleoside mono phosphate) 

Adenylic acid, thymidylic acid, guanylic acid, uridylic acid and cytidylic acid are nucleotides. 

Nucleic acids like DNA and RNA consist of nucleotides only. DNA and RNA function as genetic material.