purine

Z-DNA

... lefthanded helix, character ized by alternating purine s and pyrimidine s, and which may be the target of a DNA -binding protein . . Full article >>> Z-DNA : Alternative left-handed form of the double helix which retains Watson-Crick type base pair ing. Full article >>>...

Uric acid

...be habit forming. Full article >>> purine base ; basic compound s related in structure to uric acid ; examples include adenine and guanine , which are bases and constituents of nucleic acids Source: Noland, George B. 1983. General Biology , 11th Edition. St. Louis, MO. C. V. Mosb...

Upstream

... >>> The sequence consists of 4-9 purine residue s, located 8-13 bp upstream of the initiation codon . Full article >>> Where several alternative polyadenylation sites are found, preference is governed by a third sequence element upstream of AAUAAA. PolyA tail s ...

Transversion

...tation a base pair substitution in which the purine - pyrimidine orientation on each DNA strand i...or a mutation caused by the substitution of a purine for a pyrimidine , and vice versa, in DNA or RNA . (Cf. Transition .) ... Full article >&...

Transition

...r substitution in which the orientation of the purine and pyrimidine bases on each DNA strand r...ed by the substitution in DNA or RNA of one purine by the other, and similarly with the pyrimidine s. (Cf. transversion .) Related Terms: Mutation ...

Thymine

...ry base pair s - base -pairing between a larger purine base ( adenine or guanine ) and a smaller pyrimidine base ( cytosine or thymine ) while DNA is in its double-helix. (A/T, G/C) ... Full article >>> pyrimidine : a type of nitrogenous base in DNA molecule s that has o...

Substitution

...utation s from one pyrimidine to another or one purine to another (horizontals in diagram) are called t...ransition s. Mutation s from a pyrimidine to a purine , or the reverse (verticals and diagonals in diagram), are called transversion s. Full article ...

Strand

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> Therefore each strand of DNA or RNA has a free 3' C at one end and a free 5' C at the other. The free 3' C normally carries a ...

Somatic cells

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> All other cells are somatic cells . globular proteins Soluble proteins with a globular (somewhat rounded) shape. Their axial ...

Somatic cell

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> All other cells are somatic cell s . globular proteins Soluble proteins with a globular (somewhat rounded) shape. Their axia...

Somatic

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> All other cells are somatic cells . globular proteins Soluble proteins with a globular (somewhat rounded) shape. Their axia...

Site

... apyrimidinic site resulting from the loss of a purine or pyrimidine residue from the DNA . A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ... Full article >>> Binding site Specific DNA / RNA sequence s a protein or protein complex bind. Some examples of protein bi...

Ribonucleic acid

...otide of chain of phosphates, ribose sugars, and purine and pyrimidine s. ribose A 5-carbon sugar important in RNA and many other compound s. Full article >>> Ribonucleic acid ( RNA ): A chemical found in the nucleus and cytoplasm of cells ; it plays an important role in protei...

Pyrimidine

...;> Pyrimidine de novo biosynthesis Unlike purine s, pyrimidine s are assembled before being attach...T U V W X Y Z ... Full article >>> purine s and pyrimidine s polyols — compound s with hydroxyl groups on a backbone of 3 to 6 carbon...

Purine

... >>> A type of nitrogen base ; the purine bases in DNA and RNA are adenine and gua...genous base ) that occurs in nucleic acids . The purine s in DNA and RNA are adenine and guanine . 7 H- Purine ... Full article >>> ...

Polysaccharides

...deunits. nucleoside s - compound composed of a purine or pydimidine base linked to either a ribose or deoxyribose sugar. DNA and RNA are not polymers of nucleoside s. Full article >>> peptidoglycan A major component of bacteria l cell wall s consisting of parallel hetero polys...

Phage

...urs in nucleic acids . In DNA molecule s, the purine s are adenine and guanine . Full article >>> Phage A virus for which the natural host is a bacteria l cell . Used as a vector for cloning segment s of DNA . Genome ... Full article >>> Phage head The...

Nucleotide

...DNA or RNA consisting of a nitrogenous base ( purine in adenine and guanine , pyrimidine in thym..., 5-carbon sugar (ribose or deoxyribose ), and a purine or a pyrimidine ; the purine s are adenine and guanine , and the pyrimidine s are cytosine ,...

Nucleoside

...;> nucleoside s - compound composed of a purine or pydimidine base linked to either a ribose or...62;> NUCLEOSIDE - The composite sugar and purine or pyrimidine base which are present in nucleotide s which are the basic building blocks of D...

Nucleic acids

...: ... Full article >>> adenine A purine base ; component of nucleotide s and nucleic acids . A nitrogen base found in both DNA and RNA . adenohypophysis An endocrine gland. adenophorea The class of nematodes formerly called Aphasmidia. Examples: Trichinella, Trichuris. Full art...

Nucleic acid

... nucleic acid synthesis (it is converted into purine s and thymidine) as well as protein synthesis (precursor of the amino acids methionine and glycine) However, ... Full article >>> Nucleic acid hybridization Formation of a double- strand ed molecule by base pair ing betwee...

Nuclear membrane

...matrix. nucleoside A compound consisting of a purine or pyrimidine base covalently linked to a pentose, but lacking a phosphate. Full article >>>...

Nitrogenous base

... having the chemical properties of a base . See purine and pyrimidine . Related Terms: Purine ... Fu...DNA (and RNA ) molecule s; two major types are purine s and pyrimidine s. nonvascular plants : the plant s that do not have specialized tissue s to t...

Modification

...: In molecular biology , this term refers to the purine bases adenine and guanine , and the pyrimidine bases uracil , thymine , and cytosine , or modification of these bases . Full article >>> Since the clone d DNA may have been extensively modified (for example, protein...

Molecular biology

... in DNA ; ribose in RNA ) which is linked to a purine ( adenine or guanine ) or a pyrimidine ( thymine ( DNA ), cytidine or uridine ( RNA )). Full article >>> Among the resources at Cell and Molecular Biology Online are some pictures and movies. Or you could try Cells alive! ...

Mispairing

...ess common is a transversion , which exchanges a purine for a pyrimidine or a pyrimidine for a purine (C/T ↔ A/G). Full article >>> Tautomerisms only represent damage when they caus...

Mammals

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> Most commonly yields lactate in mammals or ethanol in yeast. fibroblast A cell of connective tissue that secretes connecti...

Initiation Codon

... >>> The sequence consists of 4-9 purine residue s, located 8-13 bp upstream of the initiation codon . Full article >>> ATG or AUG: The codon for methionine; the translation initiation codon . Usually, protein translation can only start at a methionine codon (...

Guanine

...le >>> Guanine (G) Guanine is a purine base ( nitrogenous base ) and constituent of n...s in nucleic acids , guanine is one of the two purine bases . PICTURE gymnosperms Flower less, seed -bearing land plant s; the ?rst seed plant s; ...

Double helix

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> Watson, The Double Helix : A Personal Account of the Discovery of the Structure of DNA , Atheneum, 1980, ISBN 0689706022 (first pu...

Deoxyribose

...bose : the five-carbon carbohydrate attached to purine or pyrimidine bases within DNA molecule s.... in DNA ; ribose in RNA ) which is linked to a purine ( adenine or guanine ) or a pyrimidine ( thymine ( DNA ), cytidine or uridine ( RNA )). Full ...

Deoxyribonucleic acid

...bose : the five-carbon carbohydrate attached to purine or pyrimidine bases within DNA molecule s. Full article >>> ( deoxyribonucleic acid ): The large double- strand ed molecule carrying the genetic code . It consists of four bases ( adenine , guanine , cytosine and thymi...

Dendrites

...bose : the five-carbon carbohydrate attached to purine or pyrimidine bases within DNA molecule s. Full article >>> Most neuron s are referred to as "bipolar"; they have a cell body and many small extensions, called dendrites , at one end which receive information (Fig. 1). Ful...

Dendrite

...bose : the five-carbon carbohydrate attached to purine or pyrimidine bases within DNA molecule s. Full article >>> dendrite - extension of a nerve cell , typically branched and relatively short, that receives stimuli from other nerve cells ... Full article >>> ...

Cytosine

...ry base pair s - base -pairing between a larger purine base ( adenine or guanine ) and a smaller pyrimidine base ( cytosine or thymine ) while DNA is in its double-helix. (A/T, G/C) ... Full article >>> The two strand s are held together by hydrogen bond s (electrostatic att...

Conversion

...gically usable nitrates. Nitrogenous base s. The purine s ( adenine and guanine ) and pyrimidine s ( th...gically usable nitrates. Nitrogenous base s. The purine s ( adenine and guanine ) and pyrimidine s ( thymine , cytosine , and uracil ) that comprise D...

Compound

...;> nucleoside s - compound composed of a purine or pydimidine base linked to either a ribose or deoxyribose sugar. DNA and RNA are not polymers of nucleoside s. Full article >>> Vitamin An organ ic compound that is required in relatively small amounts for growth of a...

Complement

...ry base pair s - base -pairing between a larger purine base ( adenine or guanine ) and a smaller pyrimidine base ( cytosine or thymine ) while DNA is in its double-helix. (A/T, G/C) ... Full article >>> Complement ary bases are assembled (U instead of T). A termination cod...

Codon

... >>> The sequence consists of 4-9 purine residue s, located 8-13 bp upstream of the initiation codon . Full article >>> At one end of the t RNA s three contig uous nucleotide s, the anti codon , specifically base pair with only a specific subset of codon triple...

Coding strand

...ditionally, there is a strong correlation between purine excess and coding strand excess, evidenced most remarkably by E. coli and Methanococcus jannaschii, an archaebacterium. Full article >>>...

Cell

...urs in nucleic acids . In DNA molecule s, the purine s are adenine and guanine . Full article >>> See also A Dictionary of Cell Biology This page has been accessed 289033 times since 8th October 1997. ¤ Top of page ¤ Back to BTO home page ... Full article >>>...

Biology

... in DNA ; ribose in RNA ) which is linked to a purine ( adenine or guanine ) or a pyrimidine ( thymine ( DNA ), cytidine or uridine ( RNA )). Full article >>> A GLOSSARY OF TERMS COMMONLY USED IN MOLECULAR BIOLOGY AGAROSE GEL ELECTROPHORESIS - A method for separating nuclei...

Bases

... form hydrogen bond s with their complement ary purine s. purine pyrimidine A T G C ... Full article >>> Nitrogenous base s. The purine s ( adeni...

Base pair

... ing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine ... pyrimidine cytosine (C) always pairs with the purine guanine (G) ... Full article >>> Two nitrogenous ( purine or pyrimidine ) bases...

Base

... ing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine ... pyrimidine cytosine (C) always pairs with the purine guanine (G) ... Full article >>> Arrhenius base : a substance which ionizes in aq...

Barr body

... pair of hydrogen-bonded nitrogenous base s (one purine and one pyrimidine ) that join the component strand s of the DNA double helix . Full article >>> the second X chromosome is inactivated to a Barr body for dosage compensation) whereas other DNA is facultative heterochromat...

Band shift assay

...: In molecular biology , this term refers to the purine bases adenine and guanine , and the pyrimidine bases uracil , thymine , and cytosine , or modification of these bases . Full article >>> These fluorobodies bind their targets specifically as shown by band shift assay s...

Bacteria

...urs in nucleic acids . In DNA molecule s, the purine s are adenine and guanine . Full article >>> phage - virus that infects bacteria ; altered phage can be used as cloning vector s. (short for bacteriophage - " bacteria eater") ... Full article >>> Spore : ...

AP site

... apyrimidinic site resulting from the loss of a purine or pyrimidine residue from the DNA . A B C D...e- strand ed or double- strand ed DNA missing a purine or pyrimidine base . Apo repressor A protein that requires binding of a small molecule co-...

AP endonuclease

...e- strand ed or double- strand ed DNA missing a purine or pyrimidine base . Full article >>> Continuation of repair requires one of several AP endonuclease s that cleave the 5' phosphodiester bond of the AP site . Additional enzymes remove the 5' or 3' remnant before repair proc...

Adenine

...ticle >>> Adenine (A): One of the purine bases found in DNA and RNA (6-amino purine ), one member of the base pair A- T ( adenine - thymine ). Full article >>> adeni...

Adapter

... two DNA molecule s. Adenine (A): One of the purine bases found in DNA and RNA (6-amino purine ), one member of the base pair A- T ( adenine - thymine ). Full article >>> Replic...