a molecule consisting of a nitrogen-containing base (adenine, guanine, thymine, or cytosine in dna; adenine, guanine, uracil, or cytosine in rna), a phosphate group, and a sugar (deoxyribose in dna; ribose in rna). dna and rna are polymers comprised of many nucleotides, strung together like beads in a necklace.
出典:Wikipedia
出典:『Wikipedia』 (2011/05/05 20:29 UTC 版)
Nucleotides are molecules that, when joined together, make up the structural units of RNA and DNA. In addition, nucleotides play central roles in metabolism. In that capacity, they serve as sources of chemical energy (adenosine triphosphate and guanosine triphosphate), participate in cellular signaling (cyclic guanosine monophosphate and cyclic adenosine monophosphate), and are incorporated into important cofactors of enzymatic reactions (coenzyme A, flavin adenine dinucleotide, flavin mononucleotide, and nicotinamide adenine dinucleotide phosphate).
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