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This is a schematic diagram of a DNA molecule showing adenine and other bases.

(genetic biology)

Grammar: noun
Definition: an organic compound that is used to construct nucleic acids (i.e. DNA and RNA)
Example:
1. Adenine and guanine are purine bases and cytosine, thymine and uracil are the pyrimidine bases.

2. There are five nitrogenous bases that construct different nucleotides: adenine, guanine, cytosine, thymine and uracil.