Purines and pyrimidines are nitrogenous bases in DNA and RNA, differing in their ring structures. Adenine and guanine are purines, while cytosine, thymine, and uracil are pyrimidines. Nucleosides contain a base and sugar, while nucleotides include a phosphate group.
Purines (adenine and guanine) and pyrimidines (cytosine, thymine, and uracil) are nitrogenous bases found in DNA and RNA. Purines have a double-ring structure, while pyrimidines have a single-ring structure.
One purine or pyrimidine differs from another based on the arrangement of atoms in their ring structures. For example, adenine and guanine differ in the composition and arrangement of nitrogenous bases.
A nucleoside consists of a nitrogenous base and a sugar molecule, while a nucleotide includes a nucleoside, a phosphate group, and forms the building blocks of DNA and RNA.
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