In DNA, they pair with their complementary pyrimidine bases, thymine and cytosine, respectively. In RNA, they pair with their complementary pyrimidine bases, uracil and cytosine, respectively. What two bases are purines? Two of the bases, adenine and guanine, are similar in structure and are called purines. The other two bases,Read More →

Because purines always bind with pyrimidines – known as complementary pairing – the ratio of the two will always be constant within a DNA molecule. … There are two main types of purine: Adenine and Guanine. Both of these occur in both DNA and RNA. Who purines can bond together?Read More →