Nitrogenous Base
A nitrogenous base is a nitrogen-containing ORGANIC COMPOUND that forms an essential component of NUCLEOTIDES in DNA and RNA, where it participates in BASE PAIRING to store and transmit GENETIC INFORMATION.
A nitrogenous base, also called a NUCLEOBASE, is a nitrogen-rich ORGANIC MOLECULE that combines with a PENTOSE SUGAR and PHOSPHATE GROUP to form a NUCLEOTIDE, the basic unit of NUCLEIC ACIDS. Nitrogenous bases are classified into two major groups: PURINES, which have a double-ring structure and include ADENINE and GUANINE, and PYRIMIDINES, which have a single-ring structure and include CYTOSINE, THYMINE, and URACIL. These bases form specific COMPLEMENTARY BASE PAIRS through HYDROGEN BONDS, allowing accurate storage, replication, and expression of GENETIC INFORMATION. In DNA, adenine pairs with thymine and guanine pairs with cytosine, while in RNA, uracil replaces thymine and pairs with adenine.
• Nitrogenous bases are important parts of DNA and RNA molecules. • They are one of the three components of a nucleotide: - Nitrogenous base. - Sugar molecule. - Phosphate group. • They carry the genetic code used by living organisms. • They are divided into two groups: - Purines: adenine and guanine. - Pyrimidines: cytosine, thymine, and uracil. • Specific pairing of bases helps maintain genetic information: - Adenine pairs with thymine in DNA. - Adenine pairs with uracil in RNA. - Guanine pairs with cytosine. • They are essential for DNA replication, RNA formation, and protein production.
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