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Nucleic Acids, Nucleotides, and Nucleosides

Complex compounds of high molecular weight occurring in living cells. These are basically of two types, ribonucleic (RNA) and deoxyribonucleic (DNA) acids, both of which consist of nucleotides (nucleoside phosphates linked together by phosphate bridges).

Nucleic Acids

High molecular weight polymers containing a mixture of purine and pyrimidine nucleotides chained together by ribose or deoxyribose linkages.

Nucleotides

The monomeric units from which DNA or RNA polymers are constructed. They consist of a purine or pyrimidine base, a pentose sugar, and a phosphate group. (From King and Stansfield, A Dictionary of Genetics, 4th ed)

Nucleosides

Purine or pyrimidine bases attached to a ribose or deoxyribose. (From King and Stansfield, A Dictionary of Genetics, 4th ed)