pyrimidine

Pyrimidines are heterocyclic ORGANIC COMPOUNDS that form one of the two major categories of NUCLEOBASES within NUCLEOTIDES. Unlike PURINES, pyrimidines contain a single-ring structure. The main biological pyrimidines are CYTOSINE, present in both DNA and RNA, THYMINE, found mainly in DNA, and URACIL, found mainly in RNA. Pyrimidines participate in complementary BASE PAIRING during storage and transmission of GENETIC INFORMATION.

Pyrimidines are DNA and RNA bases with a single-ring structure, including cytosine, thymine, and uracil.

• Pyrimidines are nitrogen-containing bases. • They have a single-ring structure. • Main pyrimidines: - Cytosine. - Thymine. - Uracil. • They pair with purine bases. • They help form DNA and RNA genetic codes.