Science / Genetics / Nucleotide: A subunit of dna or rna consisting of a nitrogenous base (adenine, guanine, thymine, or cytosine in dna: adenine, guanine, uracil, or cytosine in rna), a phosphate molecule, and a sugar molecule (deoxyribose in dna and ribose in rna). Thousands of nucleotides are linked to form a dna or rna molecule. See dna, base pair, rna.


Science / Biology / Nucleotides: The subunits of nucleic acids; composed of a phosphate, a sugar, and a nitrogen-containing base. The fundamental structural unit of the nucleic acid group of organic macromolecules. Some nucleotides a MORE

Nucleotide Base

Science / Chemistry / Nucleotide Base: A heterocyclic nitrogen-containing base that is a constituent of nucleotides. Examples are adenine, guanine, thymine, uracil, and cytosine. MORE


Science / Genetics / Oligonucleotide: A molecule usually composed of 25 or fewer nucleotides: used as a dna synthesis primer. MORE