adenine a definition
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adenine Adenine definition, Biochemistry. a purine base, C 5 H 5 N 5 , one of the fundamental components of nucleic acids, as DNA, in which it forms a base pair with thymine, and RNA, in which it pairs with uracil. Symbol: A. See more.
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thymine Medical Definition of THYMINE. : a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA—compare adenine, cytosine, guanine, uracil.Britannica.com: Encyclopedia article about thymine. a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA — compare adenine, cytosine, guanine, uracil.
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Cytosine Cytosine (C) is one of the four main bases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in 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 position 2).
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thymine Definition of THYMINE. : a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA — compare adenine, cytosine, guanine, uracil.See thymine defined for kids. a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA — compare adenine, cytosine, guanine, uracil.
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Vitamin B4 (adenine) Adenine forms adenosine, a nucleoside, when attached to ribose, and deoxyadenosine when attached to deoxyribose, and it forms adenosine triphosphate (ATP), a nucleotide, when three phosphate groups are added to adenosine.
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Thymine: Structure & Definition This lesson will describe the definition and structure of thymine as it relates to the formation of DNA. Also, there will be a small discussion about key facts that separate thymine from the other bases used to form the DNA helix.ach respective base is in the shape of a ring-like form and there are two types. A purine is a base that contains a double ring form. By contrast, a pyrimidine is a base that contains a single ring form. Adenine and guanine are the purines. Thymine and cytosine are the pyrimidines.
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histamine Definition of histamine : a compound C 5 H 9 N 3 especially of mammalian tissues that causes dilation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion, that is released during allergic reactions, and that is formed by decarboxylation of histidine
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Adenosine A purine nucleoside that has adenine bound to a ribose sugar by a glycosidic bond. Supplement. Adenosine is found in all living organisms as a structural component of important biomolecules such as DNA and RNA. It is also a major molecular component of ATP, ADP, and AMP. It is thus involved in various physiologic processes such as energy transfer (e.g. as ATP) and signal transduction (i.e. as cAMP).
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base 1 c. The number that is raised to a particular power in a given mathematical expression. In the expression an, a is the base. 3. Biology One of the purines (adenine or guanine) or pyrimidines (cytosine, thymine, or uracil) found in DNA or RNA.
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- Nitrogenous base: A molecule that contains nitrogen and has the chemical properties of a base. The nitrogenous bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C). The nitrogenous bases in RNA are the same, with one exception: adenine (A), guanine (G), uracil (U), and cytosine (C). Last Editorial Review: 5/13/2016.
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adenosine a compound derived from nucleic acid, composed of adenine and a sugar, d-ribose. Adenosine is the major molecular component of the nucleotides adenosine diphosphate, adenosine monophosphate, and adenosine triphosphate and of the nucleic acids DNA and RNA.Also called adenine-d-ribose.See also adenosine phosphate. compound derived from nucleic acid, composed of adenine and a sugar, d-ribose. Adenosine is the major molecular component of the nucleotides adenosine diphosphate, adenosine monophosphate, and adenosine triphosphate and of the nucleic acids DNA and RNA. Also called adenine-d-ribose. See also adenosine phosphate.
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adenine A purine base that is a component of DNA and RNA, forming a base pair with thymine in DNA and with uracil in RNA. Adenine is also part of other biologically important compounds, such as ATP, NAD, and vitamin B-12, and occurs in tea. Chemical formula: C 5 H 5 N 5.
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- Adenosine triphosphate: A nucleotide compound that is of critical importance for the storage of energy within cells and the synthesis of RNA.Abbreviated ATP.denosine triphosphate: A nucleotide compound that is of critical importance for the storage of energy within cells and the synthesis of RNA. Abbreviated ATP.
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Thymine Thymine /ˈθaɪmɨn/ (T, Thy) is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters G–C–A–T. The others are adenine, guanine, and cytosine. Thymine is also known as 5-methyluracil, a pyrimidine nucleobase. In RNA, thymine is replaced by the nucleobase uracil. Thymine was first isolated (from calves' thymus glands) in 1893 by Albrecht Kossel and Albert Neumann.
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Adenine: Structure, Overview Guanine, the other purine, always pairs with the pyrimidine cytosine. These couplings are known as base pairs. Adenine is of equal importance in RNA. However, in RNA, adenine pairs with a base called uracil as thymine is not present.It is the particular sequencing of the base pairs within strands of DNA that determine the unique genetic code of each living organism.he sides of the ladder are composed of a sugar-phosphate combination. The rungs of the ladder are the nitrogenous bases adenine, thymine, guanine, and cytosine. Each individual rung consists of two bases bonded together by hydrogen bonds. Because of their size and structure, purines always pair with pyrimidines.
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Building blocks of DNA Summary. Adenine (A), cytosine (C), guanine (G), and thymine (T) are the components of nucleic acid that make up DNA.Downloads.Downloads.denine (A), cytosine (C), guanine (G), and thymine (T) are the components of nucleic acid that make up DNA. Downloads. Downloads.
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adenosine adenosine - (biochemistry) a nucleoside that is a structural component of nucleic acids; it is present in all living cells in a combined form as a constituent of DNA and RNA and ADP and ATP and AMP.
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- Adenine (Science: biochemistry) a nitrogenous base, one member of the basepair a-T . (biochemistry)Purine base found in dna paired with thymine, in rna paired with uracil. Adenine is one of the bases that form part of a nucleotide, the structures that are present in dna chains. Retrieved from https://www.biology-online.org/dictionary/index.php?title=Adenine&oldid=71277
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amp Medical Definition of AMP. : a nucleotide C10H12N5O3H2PO4 that is composed of adenosine and one phosphate group and is reversibly convertible to ADP and ATP in metabolic reactions—called also adenosine monophosphate; compare cyclic amp.
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Adenine Adenine /ˈaedɨnɨn/ (ˈædɨnɨn, A) ade is a (nucleobase a purine) derivative with a variety of roles in biochemistry including cellular, respiration in the form of both the-energy rich adenosine (TRIPHOSPHATE) atp and the cofactors nicotinamide adenine (DINUCLEOTIDE) nad and flavin adenine (DINUCLEOTIDE). fad
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adenovirus Definition of adenovirus. : any of a family (Adenoviridae) of DNA viruses originally identified in human adenoid tissue, causing infections of the respiratory system, conjunctiva, and gastrointestinal tract, and including some capable of inducing malignant tumors in experimental animals.
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adenoid Medical Definition of adenoid. 1: an abnormally enlarged mass of lymphoid tissue at the back of the pharynx characteristically obstructing the nasal and ear passages and inducing mouth breathing, nasality, postnasal discharge, and dullness of facial expression—usually used in plural.
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- aquiline. adj. 1. (Anatomy) (of a nose) having the curved or hooked shape of an eagle's beak. 2. (Zoology) of or resembling an eagle. [C17: from Latin aquilīnus, from aquila eagle].ood day, age about forty, height about five feet nine, black hair, generally rather handsome visage, complexion dark, eyes dark, thin, long and sallow face, aquiline nose but not straight, having a peculiar inclination towards the left cheek which imparts a sinister expression.
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- Full Definition of AQUILINE. 1. 2. : of, relating to, or resembling an eagle. — aq·ui·lin·i·ty \ˌa-kwə-ˈli-nə-tē\ noun.ull Definition of AQUILINE. 1. 2. : of, relating to, or resembling an eagle. — aq·ui·lin·i·ty \ˌa-kwə-ˈli-nə-tē\ noun.
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adenoid Definition of adenoid. : either of two abnormally enlarged masses of lymphoid tissue at the back of the pharynx that usually obstruct the nasal and ear passages; also : such a mass when not abnormally enlarged —usually used in plural.