Pyrimidine

pyrimidine
important organic compounds (bases) such as cytosine, thymine, and uracil, which are constituents of nucleic acids
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Pyrimidine de novo biosynthesis
Unlike purines, pyrimidines are assembled before being attached to 5-phosphoribosyl-1-pyrophosphate (PRPP). The first step begins with formation of carbamoyl phosphate by carbamoyl phosphate synthetase II.
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Pyrimidine Chemical namePyrimidine Chemical formulaC4H4N2 Molecular mass80.09 g/mol Density1.016 g/ml Melting point20 - 22 C Boiling point123 - 124 C CAS number289-95-2 SMILESC1=NC=NC=C1 ...
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Pyrimidine
A nitrogen-containing, single-ring, basic compound (cf. nitrogenous base) that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine. The pyrimidines in RNA are cytosine and uracil.
Adenine (A) ...
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Pyrimidine: A nitrogen containing, single ring compound that occurs in nucleic acids. In DNA molecules, the pyrimidines are cytosine and thymine.
Radioactive phosphorus (32P): radioactive isotope of 31P, an element found in DNA molecules.
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pyrimidine: a type of nitrogenous base in DNA molecules that has one ring containing carbon and nitrogen atoms; two examples in DNA are cytosine (C) and thymine (T).
A-D E-K
L-P
R-Z ...
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Pyrimidine dimers
Covalent bonds formed between two adjacent pyrimidines on the same strand of DNA induced by Ultraviolet irradiation.
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pyrimidine One of the groups of nitrogenous bases that are part of a nucleotide. Pyrimidines are single ringed, and consist of the bases thymine (in DNA), uracil (replacing thymine in RNA), and cytosine. PICTURE ...
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pyrimidine
A nitrogenous base, such as cytosine, thymine, or uracil, with a characteristic single-ring structure; one of the components of nucleic acids.
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PYRIMIDINE BASES - Cytosine (C), Thymine (T) or Uracil (U) (see NUCLEOTIDE).
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pyrimidine An organic base composed of a single ring of carbon and nitrogen atoms; parent substance of several bases found in nucleic acids.
pyrogenic Substance that causes a rise in body temperature; causes fever.
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Pyrimidine: A nitrogen- containing, double- ring, basic compound that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine; in RNA, cytosine and uracil.
R ...
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A pyrimidine base that appears in RNA in place of thymine found in DNA. See pyrimidine.
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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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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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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prox- besides pseudo- false purine A nitrogenous heterocyclic base found in nucleotides and nucleic acids; containing fused pyrimidine and imidazole rings, having the general form.
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We first map the whole genomic DNA sequences following purine-pyrimidine binary rule: change purines (A/G) to +1 and pyrimidines (C/T) to -1. This creates a 'DNA walk' along the genome.
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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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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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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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A single-stranded nucleic acid similar to DNA but having ribose sugar rather than deoxyribose sugar and uracil rather than thymine as one of the pyrimidine bases.
Also known as: ribonucleic acid ...
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