Glossary of terms

     Adenine is a purine derivative, one of the two purine bases involved in the formation of nucleotides, the structural units of DNA and RNA. In DNA, adenine binds (complementary) to thymine through two hydrogen bonds, which helps to stabilize the structure of the nucleic acid. In RNA, adenine binds to uracil (remember that in eukaryotes, RNA is a single-stranded structure).

 Angina pectoris (angina pectoris, syn. chest frog) is a disease with symptoms of sudden pain (anginal pain) in the chest due to acute lack of blood supply to the myocardium, a clinical form of coronary heart disease.