[noo-klee-uh-tahyd, nyoo-] /ˈnu kli əˌtaɪd, ˈnyu-/
any of a group of molecules that, when linked together, form the building blocks of DNA or RNA: composed of a phosphate group, the bases adenine, cytosine, guanine, and thymine, and a pentose sugar, in RNA the thymine base being replaced by uracil.
(biochem) a compound consisting of a nucleoside linked to phosphoric acid. Nucleic acids are made up of long chains (polynucleotides) of such compounds
1908, from German nucleotid (1908), from nucleo-, modern comb. form of Latin nucleus (see nucleus) + -ide, with -t- for the sake of euphony.
nucleotide nu·cle·o·tide (nōō’klē-ə-tīd’, nyōō’-)
Any of various compounds consisting of a nucleoside combined with a phosphate group and forming the basic constituent of DNA and RNA.
Any of a group of organic compounds composed of a nucleoside linked to a phosphate group. Nucleotides are the basic building blocks of nucleic acids.
The molecules that form the basic modular structure of the double helix of the DNA molecule. A nucleotide consists of three molecules — a sugar, a phosphate group, and a molecule called a base. If the double helix is a twisted ladder, the sugar and phosphates form the sides of the ladder and pairs of bases form the rungs. There are four different bases, usually abbreviated A, C, G, and T for adenine, cytosine, guanine, and thymine). The order of bases in DNA determines the genetic code.
nucleotidyltransferase nu·cle·o·ti·dyl·trans·fer·ase (nōō’klē-ə-tīd’l-trāns’fə-rās’, -rāz’, nyōō’-) n. Any of various enzymes that catalyze the transfer of nucleotide residues from nucleoside diphosphates or triphosphates into dimer or polymer forms.
nucleotoxin nu·cle·o·tox·in (nōō’klē-ə-tŏk’sĭn, nyōō’-) n. A toxin acting upon the cell nuclei.
[noo-klee-uh s, nyoo-] /ˈnu kli əs, ˈnyu-/ noun, plural nuclei [noo-klee-ahy, nyoo-] /ˈnu kliˌaɪ, ˈnyu-/ (Show IPA), nucleuses. 1. a central part about which other parts are grouped or gathered; core: A few faithful friends formed the nucleus of the club. 2. Biology. a specialized, usually spherical mass of protoplasm encased in a double membrane, […]
noun 1. . noun 1. any instrument used to measure the size and number of dust particles per unit volume in the atmosphere.