What is the correct order of steps. Within a double-stranded DNA molecule, thymine bases on one strand pair with adenine bases on the opposite strand. Codon (image) Uracil (image) Anticodon (definition) group of three bases on a tRNA molecule that are complementary to an mRNA codon. Uracil-N glycosylase deficiency is transmitted as an AR disease. Related to this Question. Return to Modified Bases Modifications. Last updated. The nitrogenous base comes under the type of pyrimidine base, which appears as a single ring structure within the backbone of ribonucleic acid where it complements pairs with the purine base adenine by two hydrogen bonds. Les. thymine c. American & British English pronunciation of male & female voi. (YOOR-uh-sil) A chemical compound that is used to make one of the building blocks of RNA. from . . from . uracil - Meaning in Odia, what is the meaning of uracil in Odia dictionary, pronunciation, synonyms, usage examples and definitions of uracil in Odia and English. Uracil phosphoribosyltransferase (UPP) catalyzes the initial step in this pathway and is required for the establishment of photosynthesis, as revealed by analysis of upp mutants. premium features;. Additionally, they participate in cell signaling and form a second messenger in cellular processes. Look through examples of Uracil translation in sentences, listen to pronunciation and learn grammar. Symbol: U. Unit Definition One unit is defined as the amount of enzyme that catalyzes the release of 60 pmol of uracil per minute from double-stranded, uracil-containing DNA. Vad är Thymine - Definition, struktur, egenskaper 3. deviation, Use the word bank to answer the question. 4K . adenine: [noun] a purine base C5H5N5 that codes hereditary information in the genetic code in DNA and RNA — compare cytosine, guanine, thymine, uracil. It involves copying a gene's DNA sequence to make an RNA molecule. Definition: It is a long polymer. Study with Quizlet and memorize flashcards containing terms like DNA and RNA are polymers composed of _____ monomers. Cytosine 2. Uracil-DNA glycosylase (UDG) is a highly conserved repair enzyme that catalyzes the excision of uracil from uracil-containing single- and double-stranded DNA 1,2,3,4,5,6,7. Symbol. A nucleic acid base (or nucleobase) is a nitrogen heterocyclic compound, which serves as the informational monomer of ribonucleic acids (RNA) and deoxyribonucleic acids (DNA), the biopolymers responsible for the storage and transmission of genetic information. Heterocyclic compounds are stable, ring-shaped compounds in which not. Having been provided to the early Earth as a component in such asteroidal materials, these molecules might have played a role. Cytosine base bonds with guanine via 3 hydrogen bonds in nuclei acids. It forms the component of occurring as a component of a nucleoside or a nucleotide. Definition English: A uracil nucleotide containing a pyrophosphate group esterified to C5 of the sugar moiety. One of the bases of RNA. In RNA, uracil binds to adenine via two hydrogen bonds. Discover if uracil is found in DNA. Also see: uracil in Hindi. This means that it has a ribose as its sugar constituent with one phosphate group attached. Uracil Structure. Review on the Impact of Polyols on the Properties of Bio-Based Polyesters. Select Speaker Voice. Understand the definition and structure of the compound uracil. It should have Uracil replacing the Thymine as the base bonding with adenine in RNA. Subscribe for more videos!Here are 4 tips that should help you perfect your pronunciation of 'uracil': Break 'uracil' down into sounds : [YOOR] + [UH] + [SIL] - say it out loud and exaggerate the sounds. US English. (YOOR-uh-sil) A chemical compound that is used to make one of the building blocks of RNA. How to properly pronounce uracil? uracil Pronunciation ˈyʊər ə sɪl uracil Here are all the possible pronunciations of the word uracil. Our native speakers' recordings feature English and American spellings and definitions, delivering a natural and clear sound. The transfer of genetic material in the form of DNA fragments from one cell to another or from one organism to another. coli it hydrolyzes uracil-glycosidic bonds in single- or double-stranded DNA, excising uracil and creating alkali-sensitive abasic sites in the DNA. [2]uracil: [ u´rah-sil ] a pyrimidine base found in ribonucleic acid (RNA). Les pyrimidines possèdent un cycle azoté hexagonal comprenant quatre atomes de carbone et deux d' azote. However, 5-bromouracil frequently pairs with thymine. These abasic sites can be hydrolyzed by. coli it hydrolyzes uracil-glycosidic bonds in single- or double-stranded DNA, excising uracil and creating alkali-sensitive abasic sites in the DNA. When base pairing with adenine, uracil acts as both a hydrogen bond acceptor and a hydrogen bond donor. The genetic code is the sequence of nucleotide bases in nucleic acids ( DNA and RNA) that code for amino acid chains in proteins. Adenine. Its nucleoside contains a pyrimidine base, i. | Meaning, pronunciation, translations and. The nitrogenous bases can be divided into two categories: purines and pyrimidines. How to pronounce, definition by. The carbon (C) and nitrogen (N) atoms are bonded by single and double bonds altering each other. Cytosine forms a component of nuclei acids in form of nucleoside or nucleotide and has a melting point of 320-325 °C. The RNA molecule consists of a sequence of nucleotides, each containing a five-carbon sugar (ribose), a phosphate group, and a nitrogenous base. Each nucleotide is made up of a sugar (ribose for nucleotides in RNA, deoxyribose. Synonyms : U. uracil attached to the ribose sugar. Mark. 2: DNA Replication. Definition. In RNA, thymine is replaced with uracil. In a DNA molecule, the nucleotide thymine (T) is used in place of uracil. See examples of. one of the nitrogen-containing bases (see pyrimidine) occurring in the nucleic acid RNA. In RNA it is abbreviated with a U. Understand the definition and structure of the compound uracil. Thymine: Thymine is a pyrimidine base that is a component of DNA. However, somatic mutation detection protocols use DNA from formalin-fixed and paraffin-embedded (FFPE) tumor tissues, which can result in detection of nonreproducible sequence artifacts, especially C:G > T:A transitions, in. Uracil is represented by the letter U in RNA and is a pyrimidine. US English. Chapter 11 / Lesson 9. . Functionality – Uracil is important in the formation and function of RNA, where it creates complementary base pairs with adenine. Cytosine, thymine, and uracil are pyrimidine nucleobases. US English. Sample translated sentence: RNA uses U (uracil) instead of T ↔ Gumagamit ng U (“uracil”) ang RNA sa halip na T . Demethylation is a chemical process in the removal of CH 3 (or a methyl group) from a molecule. Learn the function of uracil, as well as its properties. US English. Thus, it only has one ring. US English. Norton and Company, Inc. Related to this Question. Atoms or groups attached to this ring. Definition. However, while RNA is transcribed using only these four bases, they are. Check out the pronunciation, synonyms and grammar. Abbr. The correct answer is False. This means that it has a ribose as its sugar constituent with one phosphate group attached. Definition. The biggest difference is in their shape: DNA is a two-stranded molecule in the form of a double helix. adenine: [noun] a purine base C5H5N5 that codes hereditary information in the genetic code in DNA and RNA — compare cytosine, guanine, thymine, uracil. Discover if uracil is found in DNA. Some viruses use RNA, not DNA, as their. uracil (yoor-ă-sil) n. 2. Hydrogen bonds form between adenine and uracil, guanine and cytosine, and also guanine and uracil. With the help of enzyme uracil glycosylase such defects in DNA can be. The response rate is improved by adding leucovorin [107 R]. . Discover if uracil is found in DNA. Spontaneous hydrolysis of cytosine changes it to a uracil. Related to this Question. Spoken pronunciation of uracil in English and in Punjabi. Uracil definition: a pyrimidine base, C4H4N2O2, that is one of the fundamental components of RNA, in which it forms base pairs with adenine. Related to this Question. 2 µg DNA (10 4 -10 5 cpm/µg) in 30 minutes at 37°C. 4K . uracil noun grammarStart studying DNA to mRNA Sequence Practice. fusing gametes from two individuals to form a diploid organism. uracil noun. Thymine is also known as 5-methyluracil, a pyrimidine nucleobase. . Also known as 5-methyluracil, thymine (T) is a pyrimidine nucleobase, which pairs with adenine (A), a purine nucleobase. They consist of a six-membered ring with two nitrogen atoms and four carbon atoms, but instead of being an aromatic ring with alternating double and single bonds they all have a ketone (carbonyl group) on the 2′ carbon atom (the carbon between the two. Uracil is a demethylated form of thymine with the chemical formula C4H4N2O2. The map shown above gives the frequency of use of the term «uracil» in the different countries. ura· cil ˈyu̇r-ə-ˌsil, -səl. The base-pairing rules are rules that apply during the pairing between one purine and one pyrimidine via tight hydrogen bonds (H-bonds). One of the bases of RNA. Found in RNA, it base pairs with adenine and replaces thymine during DNA transcription. coli CJ236 dut−ung −) at +37°C in 60 minutes. Hence, compared to DNA, RNA molecules are relatively small. : a pyrimidine base C4H4N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of RNA compare adenine,. io free pronunciation tutorials. metabolism: Pyrimidine ribonucleotides. The meaning of URACIL is a pyrimidine base C4H4N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of RNA. Definition. Definition and meaning can be found here:Definition. U A pyrimidine base, C4H4N2O2, that is an essential constituent of RNA. 11. The molecule formed as a result of transcription: a) has uracil (U) instead of thymine (T) b) is identical in all ways (chemically, physically) to the DNA and thereby carries the code accurately. Learn the function of uracil, as well as its properties. Understand the definition and structure of the compound uracil. Background Total neoadjuvant therapy (TNT) is a novel treatment strategy that is an alternative to preoperative chemoradiotherapy (CRT) for locally advanced rectal cancer (LARC). Chapter 11 / Lesson 9. uracil. It is a part of both nucleosides and a nucleotide. Guanine, 1. Julia. Which of the following is found in protein, but is not found in DNA? (a) Sulfur (b) Phosphorous (c) Carbon (d) Nitrogen (e) Oxygen. Média de décryptage, Futura vous emmène à la rencontre des découvertes et innovations qui. Francis Crick and Dr. Uracil was identified in the sample returned from the asteroid Ryugu. Why is uracil used in RNA? Uracil is energetically less expensive for the production of thymine. A simple adenine definition is a chemical compound used to make the nucleotide building blocks of DNA and RNA as well as substances that store and provide energy for cells. It pairs with adenine and is symbolised by U. Genomic patterns of uracil enrichment upon the effect of two TS inhibitory drugs indicated a strong correlation with replication timing and, to a lesser extent, with the more actively transcribed euchromatin. DNA is the genetic material found in all living organisms, ranging from single-celled bacteria to multicellular mammals. The simplest member of the family is pyrimidine itself, with molecular formula C4H4N2. Pick your prefered accent: Alex. Listen to the pronunciation of Uracil and learn how to pronounce Uracil correctly. Helicase. They were first described by Dr. In the case of RNA, thymine is replaced with uracil (U). (a) adenine (b) cytosine (c) uracil (d. after it has been transcribed from DNA but. Learn how to say Uracil with EmmaSaying free pronunciation tutorials. Each nucleic acid contains four of five possible nitrogen-containing bases: adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U). C. It under normal conditions is not seen in DNA but is present in RNA replacing thymine. You'll be able to mark your mistakes quite. The five bases are adenine, guanine, cytosine, thymine, and uracil, which have the symbols A, G, C, T, and U, respectively. Each nucleotide subunit is composed of a pentose sugar (deoxyribose), a nitrogenous base, and a phosphate group. DNA and RNA. Hear the pronunciation of uracil . Thymine: Structure & Definition Quiz; Uracil: Definition & Structure Quiz; What is Deoxyribonucleic Acid? - Definition & Structure Quiz; Go to Nucleic Acids - DNA and RNA: Tutoring SolutionAdenine (not adenosine) 2. The pyrimidines in DNA are cytosine and thymine; in RNA, they are cytosine and uracil. 4K . Card 1 of 50. Int deoxyUridine. As a result, cytosine is available across both DNA and RNA, together with adenine and guanine, in DNA while only thymine is present whereas uracil is generally present instead of thymine in RNA. Discover if uracil is found in DNA. Definition and meaning were removed to avoid copyright violation, but you can find them h. How to pronounce,. But in RNA, what replaces thymine?Study with Quizlet and memorize flashcards containing terms like Definition: DNA, Definition: Chromosome, In-Depth: DNA/RNA Structure and more. See more. Rate the pronunciation struggling of Uracil. See full answer below. In DNA, guanine is paired with cytosine. A nitrogenous base (also called nucleobase) is a nitrogen-containing compound that may form a nucleoside when they are attached to a five-carbon sugar ribose or deoxyribose. A cytosine is deaminated into uracil. By intravenous injection it is used for treatment of colorectal cancer, oesophageal cancer, stomach cancer, pancreatic cancer, breast cancer, and cervical cancer. US English. before it is translated into protein. Study with Quizlet and memorize flashcards containing terms like Match each vocabulary word with the letter corresponding to its correct definition. Translation. In this article, we will explore the difference between uracyl and uracil and clarify which one is. Occurrence. carrier RNA. These abasic sites can be hydrolyzed by. fluorouracil: [noun] a fluorine-containing pyrimidine base C4H3FN2O2 used as a neoplastic agent to treat some kinds of cancer. Ribonucleic acid (abbreviated RNA) is a nucleic acid present in all living cells that has structural similarities to DNA. What is Uracil. U A pyrimidine base, C4H4N2O2, that is an. The region of opened-up DNA is called a transcription bubble. It has a pyrimidine ring structure. Thymine is one of the four nitrogenous nucleobases that form the basic building blocks of deoxyribonucleic acid (DNA). com member to unlock this answer! Create your account. It is a weak acid and not much is known about its ionisation. (GW776/5-Fluorouracil Combination Tablet, NCI Thesaurus) It is a type of uracil analog. b. RNA (ribose nucleic acid) is a complex molecule that plays a big part in living cells. Uracil: Uracil is a pyrimidine base that is a component of RNA. a. A nucleic acid is a biopolymer composed of monomeric units of nucleotides. Pseudouridine is the most abundant RNA modification in cellular RNA. How to pronounce, definition by. Uracil: Definition & Structure. Learn the function of uracil, as well as its properties. The deoxyribonucleic acid (DNA) of a typical mammalian cell contains about 3 × 10 9 nucleotides. Also see: uracil in Hindi. an organic compound. helicase. Check 'uracil' translations into Croatian. Uracil is similar to thymine in terms of. Base Pair Definition. . It has a role as an antithyroid drug and a metabolite. The word or phrase uracil refers to a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine. A Dictionary of Nursing. unselfish d. How would you pronounce Thymidine?Definition Deoxyribonucleic acid (abbreviated DNA) is the molecule that carries genetic information for the development and functioning of an organism. It has adenine, thymine, Guanine and Cytosine, where adenine pairs up with thymine and guanine pairs up with cytosine, in case of RNA, thymine is replaced. All these transformations disrupt base pairing at the site of the change, and this produces a structural deformation in the double helix. ura· cil ˈyu̇r-ə-ˌsilUracil like other pyrimidines is an aromatic heterocyclic compound with a pyrimidine ring that comprises alternating nitrogen and carbon atoms. Cytosine, Thymine, and Uracil. (Ftorafur, NCI Dictionary)Definition of transformation. . US English. RNA pairing is A,U Adenine and Uracil , Guanine Cytosine. Symbol: U; ur-1 + ac (etic) + -il, of uncertain origin, originally 1905–10;Definition. Thymine Definition. The molecular formula of uracil is C 4 H 4 N 2 O 2, while the molecular formula of uridine is C. two DNA double helices. A nucleotide is an organic molecule that is the building block of DNA and RNA. As a nitrogenous base, cytosine is full of nitrogen atoms (it has three). OneDefinition. Definition. This video shows pronunciation of uracil in a sentence, uracil meaning, uracil definition, uracil phonetic, uracil synonym and uracil exampleuracil Definitio. The five bases are adenine, guanine, cytosine, thymine, and uracil, which have the symbols A, G, C, T, and U, respectively. To learn more about thymine, review the accompanying lesson on Thymine: Structure & Definition. US English. ]The RNA adds uracil (U) rather than thymine to adenine. The methylation process is the expansion of a methyl bunch(CH 3) to a molecule. DNA serves as the molecular basis of heredity through replication, expression, and translation processes. In a nucleic acid chain, a subunit that consists of a sugar, a phosphate, and a nitrogenous base. Gujarati. As for the nitrogenous base (or nucleobase) component, the common bases are adenine (A), guanine (G), cytosine (C), and uracil (U). The sequence of the four nucleotide bases encodes DNA’s information. uracil (yŏŏr´əsĬl), organic base of the pyrimidine [1] family. RNA polymerase (RNApol) is a multi-unit enzyme that is responsible for creating a complimentary strand of nucleic acid, called RNA, from a single stranded DNA template through the incorporation of adenosine, cytosine, guanine and uracil nucleotides. ChEBI: 5,6-dihydrouracil is a pyrimidine obtained by formal addition of hydrogen across the 5,6-position of uracil. The reason is RNA editing: the alteration of the sequence of nucleotides in the RNA. How to say Lyme all uracil in English? Pronunciation of Lyme all uracil with and more for Lyme all uracil. Cytosine is a pyrimidine nucleobase with a chemical formula of C 4 H 5 N 3 O. a purine base found in DNA and RNA. 1: (a) Ribonucleotides contain the pentose sugar ribose instead of the deoxyribose found in deoxyribonucleotides. piqued and more. It is generally accepted that negative discrimination against uracil in DNA is caused by the chemical instability of cytosine. Learn the function of uracil, as well as its properties. Definitions of uracil. WikiMatrix Magkakaiba rin ang mga posibleng nitrohenong beis na makikita sa dalawang klase ng asido nukleiko: adenine, cytosine, at guanine ay posible sa RNA at DNA, subalit ang thymine ay posible lamang sa DNA at ang uracil ay posible. Learn how to say Thymidine with EmmaSaying free pronunciation tutorials. haɪˈdrɒksɪl. Thymine (T) is one of the four nucleotide bases in DNA, with the other three being adenine (A), cytosine (C) and guanine (G). Uracil + Add translation Add Uracil Tagalog-English dictionary . Synonyms : U. However, there seems to be some confusion about the correct spelling and pronunciation of this key molecule. Uracil produces urea and maleic acid upon oxidative degradation in the presence of hydrogen peroxide and ferrous ions. Difficult (1 votes) Spell and check your pronunciation of uracil. Thymine Definition. It pairs with the adenine through hydrogen bonds. Our Apps are nice too! Dictionary. [2] After transcription and following synthesis, RNA can be modified with over. Record yourself saying 'uracil' in full sentences, then watch yourself and listen. uracil pronunciation with translations, sentences, synonyms, meanings, antonyms, and more. The chains of nucleotides in a nucleic acid are linked by 3′, 5′ phosphodiester linkages. Look through examples of uracil translation in sentences, listen to pronunciation and learn grammar. Definition of Uracil. noun. Get emergency medical help if you have signs of an allergic reaction (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling). How would you pronounce Uracil?What is uracil in English? Pronunciation, translation, synonyms, examples, rhymes, definitions of uracil in English. Unlike the determination of uracil and DHU levels and the derived DHU:U ratio, which have been described in previous work, the determination of thymine and DHT levels and the derived DHT:T ratio is a relatively unexplored parameter. The replication of DNA occurs during the synthesis phase, or S phase, of the cell cycle, before the cell enters mitosis or meiosis. Thymine is one of the four nitrogenous nucleobases that form the basic building blocks of deoxyribonucleic acid (DNA). A Dictionary of Nursing. Games. Structurally, nucleic acid bases are substituted purines and pyrimidines. (Wikipedia)Uracil 释义: a pyrimidine present in all living cells , usually in a combined form, as in RNA. uracil pronunciation. Location: It is located in the nucleus of a cell and in the mitochondria. ↔ En ARN, la timina es reemplazada por uracilo (U). ( A) A nucleotide (guanosine triphosphate). a sugar that is a constituent of nucleic acids. Difference Between Uridine and Uracil Definition. 4K . James Watson who are best known for discovering the helical, “twist around,” structure of DNA (1953). Figure 1. from . Biology definition: A thymine is a pyrimidine nucleobase that, as a constituent of DNA, plays a crucial role in genetic information storage and transfer. irritated c. It is a part of both nucleosides and a nucleotide. The sequence of nucleotides in DNA is referred to as the. It was isolated from herring sperm and also produced in a laboratory in 1900–1901. Description. Uracil: Definition & Structure. Dihydropyrimidine dehydrogenase deficiency. Learn the definition of 'uracil nucleotide'. Uracil, a colourless, crystalline organic compound of the pyrimidine family that occurs as a component of ribonucleic acid (RNA), a molecule involved in the transmission of hereditary characteristics. Learn the function of uracil, as well as its properties. A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. Learn the function of uracil, as well as its properties. DNA's genes are expressed, or manifested, through the proteins that its nucleotides produce with the help of RNA. English (UK) Pronunciation: Catalan Pronunciation: Chinese (Mandarin) Pronunciation: Chinese (China) Pronunciation: Chinese (Hong Kong) Pronunciation: Chinese (Taiwan) Pronunciation: Danish Pronunciation:Uracil: Definition & Structure. US English. Look through examples of Uracil translation in sentences, listen to pronunciation and learn grammar. Uracil [edit | edit source]. View this answer. In 1953, Alexander Rich with famed chemist Linus Pauling discovered the structure of RNA at Caltech using X-ray crystallography. | Bedeutung, Aussprache, Übersetzungen und BeispieleThis greatly hinders the definition and use of validated cut-off and/or reference values. In. DefinitionUracil was identified in the sample returned from the asteroid Ryugu. Nucleic acids, macromolecules made out of units called nucleotides, come in two naturally occurring varieties: deoxyribonucleic acid ( DNA) and ribonucleic acid ( RNA ). Social Security Administration public data, the first name Uracil was not present. Like the UNG from E. Definition and meaning can be found here:is grouped as a pyrimidine along with cytosine and uracil. Uracil has a melting point of 335 °C. Base + sugar + phosphate. Guanine ( / ˈɡwɑːnɪn / ⓘ) ( symbol G or Gua) is one of the four main nucleobases found in the nucleic acids DNA and RNA, the others being adenine, cytosine, and thymine ( uracil in RNA). The consideration that cells must possess an ability to remove uracil from DNA, which arises either by misincorporation of deoxyuridine monophosphate (dUMP) during DNA replication or by hydrolytic deamination of cytosine, led to the discovery of an enzyme capable of. Related to this Question. Pyrimidines are composed of single rings composed of four carbon atoms and two nitrogen atoms. It pairs with adenine and is symbolised by U. W. US English. Translation of "uracil" into French . a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine. | 意思、发音、翻译及示例RNA is a molecule that has a slightly different structure than DNA: RNA is single-stranded (as opposed to the double-stranded DNA), and contains the nitrogenous base uracil rather than thymine. A) nitrogenous bases B) a repeating sugar-nucleotide-sugar-nucleotide pattern C) a repeating sugar-phosphate-sugar. Which of the following is not an RNA base? a. The ribose sugar of RNA is a cyclical structure consisting of five carbons and one oxygen. You'll be able to mark your mistakes quite. Properties of Uracil. Start Free Trial. Propylthiouracil side effects. WordSense Dictionary: uracil - spelling, hyphenation, synonyms, translations, meanings & definitions. For example, a chemical reaction called deamination can convert a cytosine base into uracil, a base typically found only in RNA. uracil d. Definition. Learn the function of uracil, as well as its properties. In RNA, thymine is replaced by the nucleobase uracil. Den innehåller två ketogrupper vid C-2 och C-4 i dess heterocykliska pyrimidinring. Most methylated nucleotides are in the coding district of DNA minimal in the advertiser area. It under normal conditions is not seen in DNA but is present in RNA replacing thymine. Learn and practice the pronunciation of uracil. The repeating, or monomer, units that are linked together to form nucleic acids are known as nucleotides. Related to this Question. . Two patients have small deletions that created a premature stop codon. Vad är skillnaden mellan Uracil och Thymine. A nucleic acid base (or nucleobase) is a nitrogen heterocyclic compound, which serves as the informational monomer of ribonucleic acids (RNA) and deoxyribonucleic acids (DNA), the biopolymers responsible for the storage and transmission of genetic information. Ribonucleic acid, or RNA, is named on the bases of ribose sugar group found in backbone. 4K . Understand the definition and structure of the compound uracil. creating new combinations of homologous chromosomes. Refine your pronunciation of uracil with our free online dictionary. URACIL definition: a pyrimidine present in all living cells , usually in a combined form, as in RNA. Nucleotide (biology definition): the fundamental building block of nucleic acid; an organic compound made up of a nitrogenous base, a sugar, and a phosphate group. The word or phrase uracil refers to a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine. Definition of a nucleoside. Learn the function of uracil, as well as its properties.