adenine vs. adenosine

Biochemistry. a purine base, C 5 H 5 N 5 , one of the fundamental components of nucleic acids, as DNA, in which it forms a base pair with thymine, and RNA, in which it pairs with uracil. : A

Biochemistry. a white, crystalline, water-soluble nucleoside, C 10 H 13 N 5 O 4 , of adenine and ribose.