Nitrogenous bases are Adenine, Thymine, Uracil and Cytosine.
Nucleoside are Cytidine and Guanosine.
Explanation: There are two types of nitrogenous bases: Purines (Adenine and Guanine) and Pyrimidines (Cytosine, Uracil and Thymine).
A nitrogenous base when linked to a pentose sugar through a N-glycosidic linkage forms a nucleoside like adenosine, guanosine, cytidine and uridine.
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