Urine

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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Purine is a heterocyclic aromatic organic compound, consisting of a pyrimidine ring fused to an imidazole ring.
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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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urine
[Gk. ouron, urine]
The liquid waste filtered from the blood by the kidney and stored in the bladder pending elimination through the urethra.
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urine Fluid containing various wastes that is produced in the kidney and excreted from the bladder.
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urine: the product of the kidney; a watery solution of waste products, salts, organic compounds, uric acid, and urea.
uterus: a muscular organ in the pelvic cavity of female mammals; also called the womb.
V ...
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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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Murine Organism in the genus Mus. A rat or mouse.
Mutagen An agent that causes a permanent genetic change in a cell. Does not include changes occurring during normal genetic recombination.
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Purine analogs
These are relatives of the purines used in DNA synthesis. Because they interfere with DNA synthesis, they interfere with the rapid cell proliferation needed for immune responses.
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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 base that pairs with thymine in the DNA double helix. See purines.
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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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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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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dRTA (distal renal tubular acidosis) results from the failure of the a-intercalated cells in the distal tubule of the nephron to acidify the urine.
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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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urethra
A tube that releases urine from the body near the vagina in females or through the penis in males; also serves in males as the exit tube for the reproductive system.
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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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