In analyzing the number of different bases in a single-stranded messenger RNA, the correct pairing is 'A+G=U+C'. This refers Adenine, cytosine, uracil, and guanine.
According to Chargaff's criteria, DNA from all cells of all creatures should have a 1:1 ratio of pyrimidine and purine bases. More specifically, the amounts of guanine and adenine should be equal to cytosine and thymine, respectively. Adenine, cytosine, uracil, and guanine make up the four nitrogenous bases that make up RNA. Adenine (A), thymine (T), guanine (G), and cytosine (C) are the four bases that make up this code (C). In a double helix structure, bases pair off together; examples of these couples are A and T and C and G. RNA lacks thymine nucleotides and substitutes uracil bases (U), which pair with adenine.
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