This pairing always occurs in specific combinations, with cytosine and guanine always forming a pair and thymine and adenine always forming a pair.
en.wikipedia.org The particular sequence of the four different types of nucleotides (adenine, cytosine, guanine, and thymine) dictate many characteristics that constitute the organism.
en.wikipedia.org During the period 1885 to 1901, he was able to isolate and name its five constituent organic compounds: adenine, cytosine, guanine, thymine, and uracil.
en.wikipedia.org Each nucleotide has a pentose sugar, a phosphate group and nitrogenous bases like adenine, guanine, cytosine, thymine.
en.wikipedia.org