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Encyclopedia > Uracil
Chemical structure of uracil
Systematic name Pyrimidine-2,4(1H,3H)-dione
Other names Uracil, 2-oxy-4-oxy pyrimidine,
Molecular formula C4H4N2O2
Molar mass 112.08676 g/mol
Appearance Solid
CAS number [66-22-8]
Density and phase
Solubility in water Soluble.
Melting point 335 °C (608 K)
Boiling point N/A
Acidity (pKa) basic pKa = -3.4,
acidic pKa = 9.389.
Molecular shape pyrimidine
MSDS External MSDS
Main hazards carcinogen & teratogen
with chronic exposure
NFPA 704

Download high resolution version (1017x1360, 5 KB) Wikipedia does not have an article with this exact name. ... IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density, or volumic mass (ISO 31), is a measure of mass per unit volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... It has been suggested that Solid solubility be merged into this article or section. ... This article describes water from a scientific and technical perspective. ... The melting point of a crystalline solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... In chemistry and biochemistry, the acid dissociation constant, the acidity constant, or the acid-ionization constant (Ka) is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid. ... four sp³ orbitals three sp² orbitals In chemistry, hybridisation or hybridization (see also spelling differences) is the concept of mixing atomic orbitals to form new hybrid orbitals suitable for the qualitative description of atomic bonding properties. ... An example MSDS in a US format provides guidance for handling a hazardous substance and information on its composition and properties. ... The examples and perspective in this article or section may not represent a worldwide view. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... Image File history File links NFPA_704. ...

Flash point non flammable
R/S statement R
RTECS number YQ8650000
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other cations
Related compounds Thymine
Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
Infobox disclaimer and references

Uracil is a pyrimidine which is common and naturally occurring.[1] Uracil was originally discovered in 1900 and it was isolated by hydrolysis of yeast nuclein that was found in bovine thymus and spleen, herring sperm, and wheat germ.[2] Uracil is a planar, unsaturated compound that has the ability to absorb light[3] The flash point of a flammable liquid is the lowest temperature at which it can form an ignitable mixture with air. ... Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences, is a system of hazard codes and phrases for labeling dangerous chemicals and compounds. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... RTECS, also known as Registry of Toxic Effects of Chemical Substances, is a database of toxicity information compiled from the open scientific literature that is available for charge. ... The refractive index (or index of refraction) of a material is the factor by which the phase velocity of electromagnetic radiation is slowed in that material, relative to its velocity in a vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy most commonly known as NMR Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... Basic schematic of a mass spectrometer Mass spectrometry (also known as mass spectroscopy (deprecated)[1] or in common speech mass-spec) is an analytical technique used to measure the mass-to-charge ratio of ions. ... Multivalent redirects here. ... For the similarly-spelled vitamin compound, see Thiamine Thymine, also known as 5-methyluracil, is a pyrimidine nucleobase. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... Pyrimidine is a heterocyclic aromatic organic compound similar to benzene and pyridine, containing two nitrogen atoms at positions 1 and 3 of the six-member ring [1]. It is isomeric with two other forms of diazine. ... Hydrolysis is a chemical reaction or process in which a molecule is split into two parts by reacting with a molecule of water, which has the chemical formula H2O. One of the parts gets an OH- from the water molecule and the other part gets an H+ from the water. ... Typical divisions Ascomycota Saccharomycotina (true yeasts) Taphrinomycotina Schizosaccharomycetes (fission yeasts) Basidiomycota Basidiomycotina (club fungi) Urediniomycetes Sporidiales Yeasts are unicellular, eukaryotic microorganisms classified in the kingdom Fungi. ... Schematic diagram of a double-stranded nucleic acid. ... Tribes Bovini Boselaphini Strepsicerotini The biological subfamily Bovinae includes a diverse group of about 24 medium-sized to large ungulates, including domestic cattle, bison, the Water Buffalo, the Yak, and the four-horned and spiral-horned antelopes. ... In human anatomy, the thymus is an organ located in the upper anterior portion of the chest cavity. ... The spleen is a ductless, vertebrate gland that is closely associated with the circulatory system, where it functions in the destruction of old red blood cells in holding a reservoir of blood. ... Species Clupea alba Clupea bentincki Clupea caspiopontica Clupea chrysotaenia Clupea elongata Clupea halec Clupea harengus Clupea inermis Clupea leachii Clupea lineolata Clupea minima Clupea mirabilis Clupea pallasii Clupea sardinacaroli Clupea sulcata Herrings are small oily fish of the genus Clupea found in the temperate, shallow waters of the North Atlantic... The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... Species T. aestivum T. boeoticum T. compactum T. dicoccoides T. dicoccon T. durum T. monococcum T. spelta T. sphaerococcum References:   ITIS 42236 2002-09-22 For the indie rock group see: Wheat (band). ... Germ is an informal term for a pathogen, particularly bacteria (as in germ warfare). ...



Found in RNA, it base pairs with adenine and is replaced by thymine in DNA. Methylation of uracil produces thymine.[4] It turns into thymine to protect the DNA and to improve the efficiency of DNA replication. Uracil can base pair with any of the bases depending on how the molecule arranges itself on the helix, but readily pairs with adenine because the methyl group is repelled into a fixed position.[4] As stated, uracil pairs with adenosine through hydrogen bonding. Uracil is the hydrogen bond acceptor and can form up to three hydrogen bonds. Uracil can also bind with a ribose sugar to form a ribonucleoside, uridine. When a phosphate attaches to uridine, uridine 5'-monophosphate is produced.[3] Ribonucleic acid (RNA) is a nucleic acid polymer consisting of nucleotide monomers. ... Base pairs, of a DNA molecule. ... Adenine is one of the two purine nucleobases used in forming nucleotides of the nucleic acids DNA and RNA. In DNA, adenine binds to thymine via two hydrogen bonds to assist in stabilizing the nucleic acid structures. ... For the similarly-spelled vitamin compound, see Thiamine Thymine, also known as 5-methyluracil, is a pyrimidine nucleobase. ... The structure of part of a DNA double helix. ... For the similarly-spelled vitamin compound, see Thiamine Thymine, also known as 5-methyluracil, is a pyrimidine nucleobase. ... This article or section is in need of attention from an expert on the subject. ... A helix (pl: helices), from the Greek word έλικας/έλιξ, is a twisted shape like a spring, screw or a spiral staircase. ... Adenine is one of the two purine nucleobases used in forming nucleotides of the nucleic acids DNA and RNA. In DNA, adenine binds to thymine via two hydrogen bonds to assist in stabilizing the nucleic acid structures. ... In chemistry, a hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. ... Snapshot from a simulation of liquid water. ... Ribose Ribose, primarily seen as D-ribose, is an aldopentose — a monosaccharide containing five carbon atoms, and including an aldehyde functional group. ... Uridine is a molecule (known as a nucleoside) that is formed when uracil is attached to a ribose ring (also known as a ribofuranose) via a β-N1-glycosidic bond. ... Above is a ball-and-stick model of the inorganic hydrogenphosphate anion (HPO42−). Colour coding: P (orange); O (red); H (white). ...

Uracil, U, undergoes keto-enol tautomeric shifts because of its resonance structures due to the NH2 substitutents and OH substitutents. Also because any nuclear instability the molecule may have from the lack of formal aromaticity is compensated by the cyclic-amidic stability.[2] The keto tautomer is referred to the lactam structure, while the enol tautomer is referred to as the lactim structure. These tautomeric forms are predominant at pH=7. The lactam structure is the most common form of uracil. Aromaticity is a chemical property in which a conjugated ring of unsaturated bonds, lone pairs, or empty orbitals exhibit a stabilization stronger than would be expected by the stabilization of conjugation alone. ... Tautomers are organic compounds that are interconvertible by a chemical reaction called tautomerization. ... A lactam (the noun is a grammatical blend from lactone + amide) is a cyclic amide. ... Lactim is a hydroxy imide compound characterized by an enolic group in a ring configuration. ... The correct title of this article is . ...

Uracil also recycles itself to form nucleotides by undergoing a series of phophoribosyltransferase reactions.[1] Degradation of uracil produces substrates, aspartate, carbon dioxide, and ammonia.[1] Aspartic acid, also known as aspartate, the name of its anion, is one of the 20 natural proteinogenic amino acids which are the building blocks of proteins. ... == // IGOR ROCKS!!!!!!!!!!!!!!! == Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. ... Ammonia is a compound of nitrogen and hydrogen with the formula NH3. ...

C4H4N2O2 → H3NCH2CH2COO- + NH4 + CO2

Oxidative degradation of uracil produces urea and maleic acid in the presence of H2O2 and Fe2+ or in the presence of diatomic oxygen and Fe2+. Hydrogen peroxide (H2O2) is a very pale blue liquid which appears colourless in a dilute solution, slightly more viscous than water. ... FE or Fe may stand for: Further education: post-16, non-University education in the UK; Fundamentals of engineering: one of two engineering certification examinations in the USA; Iron (Fe): symbol for the chemical element ferrum. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ...

Uracil is a weak acid, the first site of ionization of uracil is not known.[5] The negative charge is placed on the oxygen anion and produces a pKa of less than or equal to 12. The basic pKa = -3.4, while the acidic pKa = 9.389. In the gas phase, uracil has 4 sites that are more acidic than water.[6] A weak acid is an acid that does not fully ionize in solution; that is, if the acid was represented by the general formula HA, then in aqueous solution a significant amount of undissolved HA still remains. ... ... In chemistry and biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant () is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid. ...


There are many laboratory syntheses of uracil available. The first reaction is the simplest of the syntheses, by adding water to cytosine to produce uracil and ammonia.[1] The most common way to synthesize uracil is by the condensation of maleic acid with urea in fuming sulfuric acid[2] as seen below also. Uracil can also be synthesized by a double decomposition of thiouracil in aqueous chloroacetic acid.[2] Synthesis (from the ancient Greek σύν (with) and θεσις (placing), is commonly understood to be an integration of two or more pre-existing elements which results in a new creation. ... Cytosine is one of the 5 main nucleobases used in storing and transporting genetic information within a cell in the nucleic acids DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at... Ammonia is a compound of nitrogen and hydrogen with the formula NH3. ... Water vapor condensing over a cup of hot tea Condensation is the change in matter of a substance to a denser phase, such as a gas (or vapor) to a liquid. ... Maleic acid or (Z)-Butenedioic acid or cis-butenedioic acid or malenic acid or maleinic acid or toxilic acid is an organic compound which is a dicarboxylic acid (molecule with two carboxyl groups). ... Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... Monochloroacetic acid, CClH2COOH, (chloroacetic acid, chloracetic acid, chloroethanoic acid or monochloroethanoic acid) is a carboxylic acid which is formed by chlorinating acetic acid. ...

C4H5N3O + H2O → C4H4N2O2 + NH3
C4H4O4 + CH4N2O → C4H4N2O2 + 2 H2O + CO

Photodehydrogenation of 5,6-diuracil, which is synthesized by beta-alanine reacting with urea, produces uracil.[7] Alanine (Ala, A) also 2-aminopropanoic acid is a non-essential α-amino acid. ... Urea is an organic compound of carbon, nitrogen, oxygen and hydrogen, with the formula CON2H4 or (NH2)2CO. Urea is also known as carbamide, especially in the recommended International Non-proprietary Names (rINN) in use in Europe. ...


Uracil readily undergoes regular reactions including oxidation, nitration, and alkylation. While in the presence of PhOH/NaOCl, uracil can be visualized in the blue region of UV light.[2] Uracil also has the capability to react with elemental halogens because of the presence of more than one strongly electron donating group.[2] The most fundamental reactions in chemistry are the redox processes. ... Nitration is a general chemical process for the introduction of a nitro group in a chemical compound by means of a chemical reaction. ... Alkylation is the transfer of an alkyl group from one molecule to another. ... Phenol, also known under an older name of carbolic acid, is a colourless crystalline solid with a typical sweet tarry odor. ... ... Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of soft X-rays. ... The halogens are a chemical series of nonmetals. ...

Image:bromorxn.gif Image File history File links Bromorxn. ...

Uracil readily undergoes addition to ribose sugars and phosphates to partake in synthesis and further reactions in the body. Uracil becomes Uridine-monophosphate (UMP), uridine-diphosphate (UDP), uridine-triphosphate (UTP), and uracil-diphosphate glucose (UDP-glucose). Each one of these molecules in synthesized in the body and has specific functions. Ribose Ribose, primarily seen as D-ribose, is an aldopentose — a monosaccharide containing five carbon atoms, and including an aldehyde functional group. ... Magnification of typical sugar showing monoclinic hemihedral crystalline structure. ... Above is a ball-and-stick model of the inorganic hydrogenphosphate anion (HPO42−). Colour coding: P (orange); O (red); H (white). ... Uridine diphosphate, abbreviated UDP, is a nucleotide. ...

Image:uridine.gif Image File history File links Download high resolution version (674x778, 15 KB) Summary I created this reaction myself on 5/8/06 with Chem Draw v. ...

When uracil reactes with anhydrous hydrazine a first order kinetic reacion occurs and the ring of uracil opens up.[8] If the pH of the reaction increases to >10.5 the uracil anion forms making the reaction go much slower, the same slowing of the reaction occurs if the pH decreases because of the protonation of the hydrazine.[8] The reactivity of uracil is unchanged even if the temperature changes.[8] Hydrazine is the chemical compound with formula N2H4. ...

Image:hydrazine.gif Image File history File links Hydrazine. ...


Uracil can be used for drug delivery and as a pharmaceutical. When elemental fluorine is reacted with uracil, 5-fluorouracil is produced. 5-Fluorouracil is an anticancer drug (antimetabolite) used to masquerade as uracil during the nucleic acid replication process.[1] The drug molecule also fools the enzymes that help in this process to incorporate this compound in the replication and not uracil, this causes the biological polymer (cancer) not to continue synthesizing.[1] Drug delivery is a term that refers to the delivery of a pharmaceutical compound to humans or animals. ... Pharmacology (in Greek: pharmacon is drug, and logos is science) is the study of how chemical substances interfere with living systems. ... General Name, Symbol, Number fluorine, F, 9 Chemical series halogens Group, Period, Block 17, 2, p Appearance Yellowish brown gas Atomic mass 18. ... Fluorouracil (5-FU) is a drug that is used in the treatment of cancer. ... An antimetabolite is a chemical with a similar structural to a substance (a metabolite) required for normal biochemical reactions, yet different enough to interfere with the normal functions of cells, including cell division. ... Look up Masquerade in Wiktionary, the free dictionary. ...

Uracil's use in the body is to help carry out the synthesis of many enzymes necessary for cell function through bonding with riboses and phosphates.[1] Uracil serves as allosteric regulator and coenzyme for reactions in the human body and in plants.[9] UMP controls the activity of carbamoyl phosphate synthetase and aspartate transcarbamoylase in plants, while UDP and UTP requlate CPSase II activity in animals. UDP-glucose regulates the conversion of glucose to galactose in the liver and other tissues in the process of carbohydrate metabolism.[9] Uracil is also involved in the biosynthesis of polysaccharides and the transportation of sugars containing aldehydes.[9] In biochemistry, an enzyme or other protein is allosteric if its activity or efficiency changes in response to the binding of an effector molecule at a so-called allosteric site. ... Coenzymes are a small organic non-protein molecules that carry chemical groups between enzymes. ... ATCase or aspartate transcarbamoylase (EC 2. ... Animalia redirects here. ... Glucose (Glc), a monosaccharide (or simple sugar), is the most important carbohydrate in biology. ... Galactose (also called brain sugar) is a type of sugar found in dairy products, in sugar beets and other gums and mucilages. ... The liver is an organ in some animals, including mammals (and therefore humans), birds, and reptiles. ... The smooth endoplasmic reticulum is responsible for some carbohydrate metabolism. ... Biosynthesis is a phenomenon where chemical compounds are produced from simpler reagents. ... Polysaccharides (sometimes called glycans) are relatively complex carbohydrates. ... An aldehyde is either a functional group consisting of a terminal carbonyl group, or a compound containing a terminal carbonyl group. ...

It can also increase the risk for cancer in cases where the body is extremely deficient in folate.[10] The defiency in folate leads to increased ratio of deoxyuracilmonophosphates (dUMP)/deoxythyminemonophosphates (dTMP) and uracil misincorporation into DNA and eventually low production of DNA.[10] Folic acid (the anion form is called folate) is a B-complex vitamin (once called vitamin M) that is important in preventing neural tube defects (NTDs) in the developing human fetus. ...

Uracil can be used to determine microbial contamination of tomatoes. Only after lactic acid bacteria have contaminated the fruit, uracil appears.[11] Uracil's derivatives, that contain a diazine ring, are used in pesticides.[12] More often used as antiphotosynthetic herbicides and destroy weeds in cotton, sugar beet, turnips, soya, peas, sunflower crops, vineyards, berry plantations, and orchards.[12] A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ... Binomial name Solanum lycopersicum L. Percentages are relative to US recommendations for adults. ... Lactic acid (IUPAC systematic name: 2-hydroxypropanoic acid), also known as milk acid, is a chemical compound that plays a role in several biochemical processes. ... Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ... Diazine refers to a group of organic compounds having the molecular formula C4H4N2. ... the plane is spreading pesticide. ... Cotton ready for harvest. ... Two sugar beets - the one on the left has been cultivated to be smoother than the traditional beet, so that it traps less soil. ... Binomial name Brassica rapa L. Subsp. ... Binomial name Glycine max (L.) Merr. ... Binomial name Pisum sativum A pea (Pisum sativum) is the small, edible round green seed which grows in a pod on a leguminous vine, hence why it is called a legume. ... Bold text // Strike-through text For other uses, see Sunflower (disambiguation). ... A vineyard A vineyard is a place where grapes are grown for making wine, raisins, or table grapes. ... Several types of berries from the market. ... An orchard is an intentional planting of trees maintained for food production. ...


  1. ^ a b c d e f g Garrett, Reginald H.; Grisham, Charles M. Principals of Biochemistry with a Human Focus. United States: Brooks/Cole Thomson Learning, 1997.
  2. ^ a b c d e f Brown, D.J. Heterocyclic Compounds: Thy Pyrimidines. Vol 52. New York: Interscience, 1994.
  3. ^ a b Horton, Robert H.; et al.Principles of Biochemistry. 3rd ed. Upper Saddle River, NJ: Prentice Hall, 2002.
  4. ^ a b www.madsci.org
  5. ^ Zorbach, W.W. Synthetic Procedures in Nucleic Acid Chemistry: Physical and Physicochemical Aids in Determination of Structure. Vol 2. New York: Wiley-Interscience, 1973.
  6. ^ Lee,J.K.; Kurinovich, Ma. J Am Soc Mass Spectrom.13(8), 2005, 985-95.
  7. ^ Chittenden, G.J.F.; Schwartz, Alan W. Nature.263,(5575), 350-1.
  8. ^ a b c Kochetkov, N.K. and Budovskii, E.I. Organic Chemistry of Nucleic Acids Part B. New York: Plenum Press, 1972.
  9. ^ a b c Brown, E.G. Ring Nitrogen and Key Biomolecules: The Biochemistry of N-Heterocycles. Boston: Lluwer Academic Publishers, 1998.
  10. ^ a b Mashiyama, S.T; et al.'Anal Biochem. 330(1),2004, 58-69.
  11. ^ Hildalgo, A; et al.'J Agric Food Chem.53(2),2005, 349-55.
  12. ^ a b Pozharskii, A.F.; et al.Heterocycles in Life and Society: An Introduction to Heterocyclic Chemistry and Biochemistry and the Role of Heterocycles in Science, Technology, Medicine, and Agriculture. New York: John Wiley and Sons, 1997.

External links

  • Links to external chemical sources

v  d  e
Major Families of Biochemicals
Peptides | Amino acids | Nucleic acids | Carbohydrates | Lipids | Terpenoids | Carotenoids | Tetrapyrroles | Enzyme cofactors | Steroids | Flavonoids | Alkaloids | Polyketides
Analogues of nucleic acids: Types of Nucleic Acids Analogues of nucleic acids:
Nucleobases: Adenine | Thymine | Uracil | Guanine | Cytosine | Purine | Pyrimidine
Nucleosides: Adenosine | Uridine | Guanosine | Cytidine | Deoxyadenosine | Thymidine | Deoxyguanosine | Deoxycytidine
Nucleotides: AMP | UMP | GMP | CMP | ADP | UDP | GDP | CDP | ATP | UTP | GTP | CTP | cAMP | cADPR | cGMP
Deoxynucleotides: dAMP | TMP | dGMP | dCMP | dADP | TDP | dGDP | dCDP | dATP | TTP | dGTP | dCTP
Ribonucleic acids: RNA | mRNA | tRNA | rRNA | ncRNA | sgRNA | shRNA | siRNA | snRNA | miRNA | snoRNA | LNA
Deoxyribonucleic acids: DNA | mtDNA | cDNA | plasmid | Cosmid | BAC | YAC | HAC
Analogues of nucleic acids: GNA | PNA | TNA| LNA | morpholino -
Biochemical Family Templates
Peptides | Amino acids | Nucleic acids | Carbohydrates | Lipids | Terpenoids | Carotenoids | Tetrapyrroles | Enzyme cofactors | Steroids | Flavonoids | Alkaloids | Polyketides

  Results from FactBites:
Uracil - definition of Uracil in Encyclopedia (77 words)
Uracil is one of the four RNA bases, replacing thymine as found in DNA.
Just like thymine, uracil can form a base pair with adenine via two hydrogen bonds, but it lacks the methyl group present in thymine.
Uracil, in comparison to thymine, will more readily degenerate into cytosine.
  More results at FactBites »



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