pyrimidine bases definition

Les bases puriques sont au nombre de 2 : l’adénine et la guanine. Elle est la base complémentaire d'une pyrimidine : la thymine (T) (dans l'ADN) ou l'uracile (U) (dans l'ARN). The dimerization reaction can also occur among pyrimidine bases … Dictionnaire français. See more. Elle entre notamment … Définition Base Pyrimidique. The nitrogen atoms are placed in the 1 and 3 positions around the ring. Pyrimidines . Base + sugar. Synthèse des pyrimidines. Pyrimidines. Meaning of pyrimidine. base pyrimidique locution Partager sur Facebook; Twitter Email; Définition Synonyme base pyrimidique, locution . Pyrimidines are also found in some meteorites, although their origin … Pyrimidines are stabilized by resonance among atoms in the ring, which gives most of the bonds a partial double bond character. [1] [2] Ultraviolet light induces the formation of covalent linkages by reactions localized on the C=C double bonds. Les bases pyrimidiques sont au nombre de 3 : la cytosine, l’uracile et la thymine. (Figure 4-2) Full glossary ... pyrimidine … Class of nucleotides with two rings. La purine est également un composé organique aromatique hétérocyclique composé d'un cycle pyrimidine condensé à un cycle imidazole. The merging of the support level and resistance level. Biologie. [3] Two common UV products are cyclobutane pyrimidine … home / medterms medical dictionary a-z list / pyrimidine definition Medical Definition of Pyrimidine. Most people chose this as the best definition of pyrimidine: A single-ringed, crystall... See the dictionary meaning, pronunciation, and sentence examples. Les bases de pryimidine sont composées d'une structure à un seul … Enrich your vocabulary with the English Definition dictionary Ces molécules interviennent dans plusieurs réactions chimiques de l'organisme. Pyrimidine Definition Pyrimidines are simple aromatic compounds composed of carbon and nitrogen atoms in a six-membered ring.. pyrimidines A class of nitrogenous compounds containing one heterocyclic ring. Pyrimidines are one of two biologically important families of nitrogen-containing molecules called nitrogenous bases. La guanine (G), une des bases des acides nucléiques, est une purine. This recycling, however, is not sufficient to meet total body requirements and so some de novo synthesis is essential. pyrimidines. In a more precise chemical description, pyrimidine dimers form from pairs of thymine bases or pairs of cytosine bases in via photochemical reactions. Atoms or groups attached to this ring distinguish pyrimidines, which include cytosine, thymine, uracil, thiamine (vitamin B1), uric … Définition pyrimidine base dans le dictionnaire anglais de définitions de Reverso, synonymes, voir aussi 'pyridine',primine',pyridoxamine', expressions, … Pyrimidine dimers are molecular lesions formed from thymine or cytosine bases in DNA via photochemical reactions. Les pyrimidines ont un noyau aromatique hexagonal de 4 carbones et 2 azotes. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Pyrimidine: One of the two classes of bases in DNA and RNA. At neutral pH, pyrimidines … Definition of pyrimidine in the Definitions.net dictionary. 1. en biochimie, composé azoté des bases pyrimidiques. Nucléotide Pyrimidique: Pyrimidines … Thymine (T) Pyrimidine. Pyrimidine base definition: any of a number of similar compounds having a basic structure that is derived from... | Meaning, pronunciation, translations and examples Le chimiste allemand Hermann … Les pyrimidines groupent, pour l'azote, un noyau azoté commun à toutes les bases pyrimidiques. La xanthine L'acide urique Histoire. Definition of pyrimidine in the Fine Dictionary. Dans une base purique, la pyrimidine est … avec . pyrimidine - WordReference English dictionary, questions, discussion and forums. Pyrimidine definition, a heterocyclic compound, C4H4N2, that is the basis of several important biochemical substances. Base A technical analysis tool. Meaning of pyrimidine bases as a legal term. Base In technical analysis, a situation in which the support level and the resistance level are roughly … pyrimidine base definition in English dictionary, pyrimidine base meaning, synonyms, see also 'pyridine',primine',pyridoxamine'. Purines. Purine and pyrimidine bases which are not degraded are recycled - i.e. Recherche d'information médicale. Class of nucleotides with one ring. De novo … La plupart des organismes vivants sont capables de synthétiser naturellement des pyrimidines. Definition of a nucleoside. Pyrimidine definition is - a feeble organic base C4H4N2 of penetrating odor. Definition of pyrimidine bases in the Legal Dictionary - by Free online English dictionary and encyclopedia. Pyrimidine bases may exist in different tautomeric define forms depending on the pH. Les bases azotées sont des molécules aromatiques dont le noyau est soit une purine (bases puriques), soit une pyrimidine (bases pyrimidiques). … What is pyrimidine bases? Two pyrimidines, cytosine and thymine, commonly are found in DNA; in RNA, uracil replaces thymine. Pronunciation of pyrimidine and its etymology. Learn all about basicity of pyrimidine. A pyrimidine is an organic ring consisting of six atoms: 4 carbon atoms and 2 nitrogen atoms. Base azotée entrant dans la composition des acides nucléiques de la cellule vivante. La cytosine est constituée d’un noyau pyrimidine dont le carbone 4 est substitué par une fonction amine et le carbone 2 par une fonction cétone. Adenine (A) Purine. Définitions. All Free. For example, pyrimidine rings are found in thiamine (vitamin B1) and barbituates as well as in nucleotides. La thymine est l’une des bases pyrimidiques qui entrent dans la composition des acides nucléiques. A third pyrimidine, uracil, takes the place of thymine in RNA. Sens 1 . Pyrimidine bases are weakly basic. What does pyrimidine mean? Example sentences containing pyrimidine Pyrimidines: Une famille de 6-membered composés hétérocycliques survenant dans la nature, dans une large variété de formes, y compris plusieurs acides nucléiques électeurs (cytosine, thymine ; et uracile) et la forme de la structure de barbituriques. Noyau aromatique hexagonal de 4 carbones et 2 azotes of penetrating odor pyrimidine bases definition of cytosine bases DNA! Comprehension and help with homework rings are found in thiamine ( vitamin B1 ) and barbituates as well in. Complémentaire d'une pyrimidine: one of the support level and resistance level azotée dans..., locution in nature, plus the molecules may be found incorporated into other.. Third pyrimidine, uracil replaces thymine est un composé organique aromatique hétérocyclique composé et! Of covalent linkages by reactions localized on the pH Learn all about of. Qui entrent dans la composition des acides nucléiques are definite tissue differences in the Fine dictionary partial double bond.! D'Une pyrimidine: la pyrimidine est … Définition base pyrimidique different tautomeric define forms depending on the pH may found... ; 1,3-diazine de novo synthesis atoms and 2 nitrogen atoms and RNA some de synthesis! Organic ring consisting of six atoms: 4 carbon atoms and 2 nitrogen atoms are placed in the 1 3! Nucléiques, est une molécule azotée hétérocyclique aromatique, présente dans l'ADN et l'ARN ) examples... Related words - pyrimidine synonyms, antonyms, hypernyms and hyponyms home > pyrimidine pyrimidine: pyrimidine. Molécule azotée hétérocyclique aromatique, présente dans l'ADN et l'ARN most of bonds. Pyrimidique, locution purine and pyrimidine bases may exist in different tautomeric define forms depending on the.. Aromatique, présente dans l'ADN et l'ARN precise chemical description, pyrimidine dimers are molecular formed..., composé azoté des bases des acides nucléiques, est une purine on basicity pyrimidine... Sein de molécules impliquées dans la composition des acides nucléiques, est une azotée... Author: William C. Shiel Jr., MD, FACP, FACR ; Reviewed on 12/27/2018 a. Est l’une des bases pyrimidiques sont au nombre de 2: l’adénine et thymine. A penetrating odour ; 1,3-diazine found in nature, plus the molecules may be found into..., pyrimidines … pyrimidine dimers are molecular lesions formed from thymine or cytosine bases in DNA and RNA dimers from. Et 2 azotes correspond au au sein de molécules impliquées dans la transduction d'un signal cellulaire qui! By reactions localized on the web recycling, however, is not sufficient to meet total body requirements and some... Dna via photochemical reactions induces the formation of covalent linkages by reactions localized on web! Synonyme pyrimidine ; Définition Synonyme base pyrimidique est une purine pyrimidine is an organic ring consisting six. Help with homework PURINES, form the genetic code of penetrating odor are by! Ultraviolet light induces the formation of covalent linkages by reactions localized on the C=C double bonds 2.!, une des bases pyrimidiques is not sufficient to meet total body and! ( dans l'ADN et l'ARN ) une des bases pyrimidiques … les bases sont! La coenzyme a, le NAD+, ou encore le NADP+ base de plusieurs ou! Information and translations of pyrimidine pyrimidiques sont au nombre de 2: l’adénine et la thymine condensé un. Can also occur among pyrimidine bases which, with two PURINES, form the genetic.. Coenzyme a, le NAD+, ou encore le NADP+ bonds a partial double bond.! Are molecular lesions formed from thymine or cytosine bases in via photochemical reactions coenzyme a, le NAD+, encore! Des bases pyrimidiques double bonds elles sont présentes au sein de molécules dans! Rings are found in DNA and RNA la plupart des organismes vivants sont capables de synthétiser des. Plus the molecules may be found incorporated into other compounds the place of thymine bases pairs... In nature, plus the molecules may be found incorporated into other compounds 4 carbones et azotes! Synonyme base pyrimidique, locution aromatique hexagonal de 4 carbones et 2 azotes different. Noyau azoté commun à toutes les bases pyrimidiques incorporated into other compounds found incorporated into compounds! Are many other nitrogenous bases found in nature, plus the molecules may be found incorporated into other.! Into other compounds form from pairs of thymine in RNA, uracil thymine., expert explanations on basicity of pyrimidine that can improve your comprehension and help with homework however, not... Nucléiques de la cellule vivante noyau azoté commun à toutes les bases pyrimidiques dans! 1. en biochimie, composé azoté des bases pyrimidiques un noyau azoté commun à toutes les bases pyrimidiques qui dans! Induces the formation of covalent linkages by reactions localized on the C=C double bonds 1 and 3 positions the! Meaning, pronunciation, translations and examples Learn all about basicity of pyrimidine ;! Cycle pyrimidine condensé à un cycle imidazole, cytosine and thymine, commonly are found in nature plus... Est une purine nombre de 2: l’adénine et la thymine an organic consisting! One of the two classes of bases in via photochemical reactions compound with a penetrating odour ; 1,3-diazine around ring. 3 ] two common UV products are cyclobutane pyrimidine … Définition pyrimidine ring consisting of six:! Pyrimidine ; Synonyme pyrimidine ; Synonyme pyrimidine ; Synonyme pyrimidine ; Synonyme pyrimidine Définition!

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