Both uracil and thymine pair with adenine, but they differ in their chemical ... One type of mutation, called a point mutation, occurs when a single nucleotide is changed. In RNA, a point mutation can ...

By virtue of complementary base- pairing ... are also found in DNA. In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3).

In DNA and RNA, purines pair with their complementary pyrimidine bases through ... and the synthesis of complex molecules. GTP is another purine nucleotide that plays a crucial role in cellular ...