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	©
Schematic diagram of a DNA molecule showing thymine 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, i.e. adenine, guanine, cytosine, thymine and uracil.