Purine

purine base; basic compounds 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. Mosby ...
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Purines from food (or from tissue turnover) are metabolised by several enzymes, including xanthine oxidase, into uric acid.
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A type of nitrogen base; the purine bases in DNA and RNA are adenine and guanine.
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 ...
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Purine Chemical namePurine Chemical formulaC5H4N4 Molecular mass120.11 g/mol Melting point214 C CAS number120-73-0 SMILESC1(NC=N2)=C2C=NC=N1 ...
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Purine
A nitrogen-containing, double-ring, basic compound (cf. nitrogenous base) that occurs in nucleic acids. The purines in DNA and RNA are adenine and guanine.
7 H-Purine ...
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Purine: A nitrogen- containing, double ring compound that occurs in nucleic acids. In DNA molecules, the purines are adenine and guanine.
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purines and pyrimidines
polyols — compounds with hydroxyl groups on a backbone of 3 to 6 carbons such as glycerol and glyceric acid. Sugars are polyols.
the amino acids listed here.
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purine: a type of nitrogenous base present in DNA molecules containing two fused rings of carbon and nitrogen atoms; two examples in DNA are adenine (A) and guanine (G).
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purine
[Gk. purinos, fiery, sparkling]
A nitrogenous base, such as adenine or guanine, with a characteristic two-ring structure; one of the components of nucleic acids.
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purine One of the groups of nitrogenous bases that are part of a nucleotide. Purines are adenine and guanine, and are double-ring structures. PICTURE ...
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PURINE BASES - Adenine (A) or Guanine (G) (see NUCLEOTIDE).
PULSED-FIELD GEL ELECTROPHORESIS (PFGE) - Separation of large (>50 kb) pieces of DNA, including complete chromosomes and genomes, ...
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purine A nitrogen-containing organic compound that contributes to the structure of a DNA or RNA nucleotide; uric acid is also derived from purines.
push factors (in urbanization)Conditions that force people out of the country and into the city.
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Purine: A nitrogen- containing, single- ring, basic compound that occurs in nucleic acids. The purines in DNA and RNA are adenine and guanine.
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A purine or pyrimidine base that differs slightly in structure from the normal bases found in DNA or RNA. Some analogs may be incorporated into nucleic acids in place of the normal base, often resulting in a base substitution mutation.
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The purines (adenine and guanine) and pyrimidines (thymine, cytosine, and uracil) that comprise DNA and RNA molecules. Nodule. The enlargement or swelling on roots of nitrogen- fixing plants. The nodules contain symbiotic nitrogen- fixing bacteria.
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base pair a pair of hydrogen-bonded nitrogenous bases (one purine and one pyrimidine) that join the component strands of the DNA double helix.
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de- from, away from, down from de novo pathway Pathway for synthesis of a biomolecule from simple precursors, such as synthesis of purine nucleotides from Asp, CO2, Gly, formate and Glu: Distinguish from a salvage pathway.
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The minima of the Purine Excess plots correlate with the origins of replication for seven bacterial genomes (Escherichia coli, Bacillus subtilis, Mycoplasma pneumoniae, Mycoplasma genitalium, Helicobacter pylori, Haemophilus influenzae, ...
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Transitions (changes from a purine - A or G - to the other purine, or a pyrimidine - C or T - to the other pyrimidine) are more likely than transversions (changes from a purine to a pyrimidine or vice-versa).
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Since transition mutations (purine to purine or pyrimidine to pyrimidine mutations) are more likely than transversion (purine to pyrimidine or vice-versa) mutations, ...
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Substitution mutations from one pyrimidine to another or one purine to another (horizontals in diagram) are called transitions. Mutations from a pyrimidine to a purine, or the reverse (verticals and diagonals in diagram), are called transversions.
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complementary base pairs - 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) ...
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Chargaff's rules showed that A = T and G = C, so there was complementary base pairing of a purine with a pyrimidine, giving the correct width for the helix.
The paired bases can occur in any order, giving an overwhelming diversity of sequences.
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For example, the (fictitious) transcription factor ZQ1 usually binds to the sequences AAAGTT, AAGGTT or AAGATT. The consensus sequence for that factor is said to be AARRTT (where R is any purine, i.e. A or G).
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