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nucleoside definition biology

(no͞o′klē-ə-sÄ«d′, nyo͞o′-) n. Any of various compounds, such as adenosine or guanosine, that consist of a sugar, usually ribose or deoxyribose, linked to a purine or pyrimidine base. They also have other roles to play. Biology. Nucleotides can define as the monomer units which unites by 3’-5’ phosphate bridges to form a “ Nucleic acid ” i.e. They are often used interchangeably, however, they are quite distinct entities. The four nitrogenous bases in DNA are adenine, cytosine, guanine, and thymine. In a nucleoside, the anomeric carbon is linked through a glycosidic bond to the N9 of a purine or the N1 of a pyrimidine. These are the monomers of which nucleic acids are composed. In sequencing, dideoxynucleotides are used. For example, DNA contains two such chains spiraling round each other in the famous double helix shape. Although these inhibitors are diverse in structure, they all induce major conformational changes to the RT molecule that disrupt its enzymatic activity. Nucleotides make up the basic units of DNA and RNA molecules. Definition of complementary base pairs The nucleotide bases in one strand of DNA or RNA that are paired with those of another strand; adenine pairs with thymine or uracil, and guanine pairs with cytosine. image Nucleosides are constituents of the nucleotides that make up nucleic acids. Nucleotide Definition: A nucleotide is an organic molecule made up of a nucleotide base, a five-carbon sugar (ribose or deoxyribose) and at least one phosphate group. Learn more. Glossary of biology terms . Nucleic acids are made up of long chains (polynucleotides) of such compounds [C20: from nucleo- + t (added for ease of pronunciation) + -ide] For the term nucleoside may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for medical and legal or special purposes. A nucleoside monophosphate is a molecule formed by a purine or pyrimidine binding to a carbohydrate (forming a nucleoside) which is bound to a phosphate group. A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a five-carbon sugar (ribose or 2'-deoxyribose) whereas a nucleotide is composed of a nucleobase, a five-carbon sugar, and one or more phosphate groups. Nucleotides, the fundamental units of RNA (ribonucleic acid) and DNA (deoxyribonucleic acid), contain a phosphate molecule attached to a nucleoside, a compound made up of a ribose moiety and a purine or pyrimidine base. Meaning and definition of nucleoside : An organic molecule consisting of a nitrogenous base joined to a five-carbon sugar. Nucleotides can be defined as the organic molecules that act as the building blocks of the genetic materials – DNA and RNA. Nucleotide definition is - any of several compounds that consist of a ribose or deoxyribose sugar joined to a purine or pyrimidine base and to a phosphate group and that are the basic structural units of nucleic acids (such as RNA and DNA). 2. A nucleoside triphosphate is a molecule containing a nitrogenous base bound to a 5-carbon sugar (either ribose or deoxyribose), with three phosphate groups bound to the sugar. The composition of some nucleosides is given: The anti-form is necessary for the proper posi­tioning of the complementary purine and pyrimi­dine bases in the double-stranded form of deoxyri­bonucleic acid. Pentose Sugars: ADVERTISEMENTS: The pentose sugar … Nitrogenous bases: The nitrogenous bases are derivatives of two parent heterocyclic compounds, i.e., purine and pyrimidine. Any of various compounds, such as adenosine or guanosine, that consist of a sugar, usually ribose or deoxyribose, linked to a purine or pyrimidine base. Learn / Biology / Atp As Nucleoside Triphosphate. (Table 4-1) Full glossary... [ >>>] A synthetic molecule that resembles a naturally occuring nucleoside, but that lacks a bond site needed to link it to an adjacent nucleotide. Definition of nucleoside : a compound (such as guanosine or adenosine) that consists of a purine or pyrimidine base combined with deoxyribose or ribose and is found especially in DNA or RNA Examples of nucleoside in a Sentence Nucleotides are building blocks of nucleic acids (DNA and RNA). Deoxyribonucleic acid ( DNA ) and ribonucleic acid ( RNA ) are nucleotide polymers. In addition, nucleotides can be broken down inside the cell into nitrogenous bases, and ribose-1-phosphate or deoxyribose-1-phosphate. Nucleoside triphosphate structure consists of a nitrogenous base linked to a 5-carbon sugar along with three phosphate molecules attached to sugar. Un nucléoside est un élément constitutif des acides nucléiques, ADN et ARN. Nucleotide definition is any - of that compounds consist of4. nucleoside An organic compound consisting of a nitrogen-containing purine or pyrimidine base linked to a sugar (ribose or deoxyribose). They are building blocks of nucleic acid, as nucleotides consist of the same components such as a nitrogenous base, sugar and a phosphate group. This is achieved by using a different backbone sugar. any of the repeating subunits of chromatin occurring at intervals along a strand of DNA, consisting of DNA coiled around histone. Thus, nucleosides can be phosphorylated by specific kinases in the cell on the sugar's primary alcohol group (-CH2-OH) to produce nucleotides. These compounds are activated in the cells by being converted into nucleotides. A nucleic acid contains a chain of nucleotides linked together with covalent bonds to form a sugar-phosphate backbone with protruding nitrogenous bases. The two chains in the double helix are held together along their length by hydrogen bonds that form between the bases on one chain and the bases on the other. Nucleosides can be produced from nucleotides de novo, particularly in the liver, but they are more abundantly supplied via ingestion and digestion of nucleic acids in the diet, whereby nucleotidases break down nucleotides (such as the thymidine monophosphate) into nucleosides (such as thymidine) and phosphate. Nucleotides are the major constituents of the DNA and RNA which is composed of nitrogenous bases, a pentose sugar and a phosphate group. In molecular biology, several analogues of the sugar backbone exist. A nucleotide is an organic molecule that is the building block of DNA and RNA. 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. It therefore cannot bond with the next base and terminates the chain, as DNA polymerases cannot distinguish between it and a regular deoxyribonucleotide. While a nucleoside is a nucleobase linked to a sugar, a nucleotide is composed of a nucleoside and one or more phosphate groups. 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