A type of molecule found in all living organisms, present mostly in chemically combined form as a component of nucleic acids, and also in smaller amounts in free form, consisting of a pentose sugar bound to a purine or pyrimidine base; two types of nucleoside, ribonucleoside and deoxyribonucleoside, are present. The most common bases present in nucleosides are adenine, cytosine, uracil, guanine, and thymine, and to a lesser extent hypoxanthine and other bases are found. The most commmon ribonucleosides composed from these bases are called adenosine, cytidine, uridine, and guanosine. The forms esterified with orthophosphoric at the 5-position of the pentose are called nucleotides. The nucleotides form the monomer units which are combined into DNA and RNA, which carry the genetic information required for reproduction in all known organisms.
A molecule consisting of a nitrogen- containing purine or pyrimidine base attached to a ribose or a deoxyribose sugar.
A biologically important molecule consisting of an amine-containing purine or pyrimidine base joined to ribose, a 5-carbon sugar.
A purine or pyrimidine base attached to a five-carbon sugar.
an individual nucleic acid base (adenine, cytosine, guanine, uracil or thymine) bonded to a single ribose or deoxyribose sugar molecule.
Purine or pyrimidine base linked glycosidically to ribose or deoxyribose, but lacking the phosphate residues that would make it a nucleotide.
One of the building blocks from which DNA and RNA are made.
A base (purine or pyrimidine) that is covalently linked to a 5-carbon (pentose) sugar. When the sugar is ribose, the nucleoside is a ribonucleoside; when it is deoxyribose, the nucleoside is a deoxyribonucleoside. Adenine, guanine and cytosine occur in both DNA and RNA; thymine occurs in DNA; and uracil in RNA. They are the building blocks of DNA and RNA. See nucleoside analogue.
Compare with nucleotide. nucleotide base bound to a five-carbon sugar.
a glycoside formed by partial hydrolysis of a nucleic acid
a building block of DNA and RNA, the genetic material
In molecular biology; a molecule composed of a sugar (2' deoxyribose in DNA; ribose in RNA) which is linked to a purine (adenine or guanine) or a pyrimidine (thymine (DNA), cytidine or uridine (RNA)). The link is through the 1' carbone atom in ribose or deoxyribose.
composed of two subunits, ribose or dideoxyribose attached to a nitrogenous base.
a base molecule+a sugar
A term refering to the combination of adenine, cytosine, guanine, or thymine with a ribose or 2-deoxyribose sugar moiety. A nucleoside is not phosphorylated.
Ribose or deoxyribose substituted at carbon N-glycosidic link by one of five heterocyclic bases.
A building block of DNA or RNA, the genetic material found in living organisms. See Nucleic Acid.
a purine or pyrimidine base linked to a sugar.
A nitrogenous base linked to a sugar.
glycosylamines that occur when a purine or pyrimidine base is covalently attached to pentose; usually attached to ribose or 2-deoxyribose.
a building block of nucleic acids, DNA, or RNA, the genetic material found in living organisms. Nucleosides are nucleotides without the phosphate groups.
a nucleotide with the phosphate group removed, leaving only a sugar and linked base remaining.
a precursor compound that is a converted to a nucleotide by the addition of a phosphate group.
a combination of one of five single or double ringed "bases" and a sugar (ribose for RNA or deoxyribose for DNA). These molecular units are the building blocks of DNA and RNA, the genetic material found in living organisms. Before being added to a DNA or RNA sequence, nucleosides must have a phosphate group added (see PHOSPHORYLATION).
The precursor of nucleic acids, consisting of an organic base and a sugar.
The molecular units that serve as the building blocks of DNA and RNA, the genetic material found in living organisms.
A chemical structure where a nitrogenous base is attaches to a sugar. In nucleic acids (RNA and DNA), nucleosides are joined together with phosphate residues to form a long chain. A chemical structure where a nucleoside is attached to a phosphate residue. The sugar molecule is in the 'middle' of the structure, having both the nitrogenous base and the phosphate attached to it.
A nucleotide without the phosphate group.
A compound (as adenosine or guanosine) that consists of a purine or pyrimidine base combined with deoxyribose or ribose and is found especially in DNA or RNA
A sugar-base compound that is a nucleotide precursor. Nucleotides are nucleoside phosphates. A nitrogen base linked to a sugar molecule.
an organic molecule made up of a nitrogenous base attached to a five carbon sugar.
a component molecule of RNA and DNA.
A small molecule composed of a purine or pyrimidine base linked to a pentose (either ribose or deoxyribose). ( Table 4-1)
Nucleosides are glycosylamines made by attaching a nucleobase (often referred to simply as bases) to a ribose or deoxyribose ring. Examples of these include cytidine, uridine, adenosine, guanosine, thymidine and inosine.