Biochemistry. a purine base, C5H5N5, 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. Symbol: A
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Scientists often assume that they should search for guanine, thymine, adenine and cytosine, the bases of DNA as we’ve known it until now.
Adenine and guanine are constituents of all nucleic acids (see below) and, hence, are found in all plant and animal tissues.