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Watercress is considered a low purine food, so it contains a minimal amount of purines. It is a great addition to a gout-friendly diet as it is not likely to trigger a gout attack due to its low purine content.
The symbol for purines (Guanine / Adenine) is "R" and for pyrimidines (Cytosine / Thymine) is "Y".
This is a basic principle of DNA base pairing called Chargaff's rule. Adenine (purine) pairs with thymine (pyrimidine), while guanine (purine) pairs with cytosine (pyrimidine). This complementary base pairing is essential for the double-stranded structure of DNA.
Adenine is the purine base that pairs up with thymine in DNA and with uracil in RNA.
Purine bases (adenine and guanine) do not bind with each other because their structural arrangement does not allow for stable hydrogen bonding interactions. The size and shape of purine bases prevent them from forming the complementary hydrogen bonding patterns required for stable base pairing in DNA.