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 ...
Pyrimidine is a heterocyclic aromatic organic compound, which is similar to benzene and pyridine and that contains two nitrogen atoms at positions 1 and 3 of the six-membered ring.
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.
Pyrimidine dimers
Covalent bonds formed between two adjacent pyrimidines on the same strand of DNA induced by Ultraviolet irradiation.
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
Rarecutter enzyme: See restriction enzyme cutting site.
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 ...
pyrimidine
A nitrogenous base, such as cytosine, thymine, or uracil, with a characteristic single-ring structure; one of the components of nucleic acids.
Pyrimidine A nitrogenous base that is a six-membered heterocyclic ring containing two nitrogen atoms and four carbon atoms; the pyrimidine derivatives cytosine, uracil, and thymine are found in nucleotides and nucleic acids.
[edit] Pyrimidine ribonucleotides
The synthesis of UMP.
The color scheme is as follows: enzymes, coenzymes, substrate names, inorganic molecules ...
PYRIMIDINE BASES - Cytosine (C), Thymine (T) or Uracil (U) (see NUCLEOTIDE).
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.
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.
uracil The pyrimidine that replaces thymine in RNA molecules and nucleotides.
ureter A muscular tube that transports urine by peristaltic contractions from the kidney to the bladder. PICTURE ...
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.
base pair a pair of hydrogen-bonded nitrogenous bases (one purine and one pyrimidine) that join the component strands of the DNA double helix.
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).
The term proposed by Freese ( 1959) for a mutation caused by the substitution of a purine for a pyrimidine, and vice versa, in DNA or RNA. (Cf. Transition.)
Related Terms:
Pyrimidine
A nitrogen-containing, single-ring, basic compound (cf.
Two nitrogenous (purine or pyrimidine) bases (adenine and thymine or guanine and cytosine) held together by weak hydrogen bonds. Two strands of DNA are held together in the shape of a double helix by the bonds between base pairs.
A subunit of DNA or RNA consisting of a nitrogenous base (purine in adenine and guanine, pyrimidine in thymine, or cytosine for DNA and uracil cytosine for RNA), a phosphate molecule, and a sugar molecule (deoxyribose in DNA and ribose in RNA).
The purines in DNA and RNA are adenine and guanine.
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.
- A base-pair substitution mutation resulting in the replacement of one purine by another purine or of one pyrimidine by another pyrimidine
Translation
- The process of biosynthesis of a polypeptide chain using genetic instructions from the mRNA ...
Glycosylated base is cytidine, it's derived from pyrimidine. It is one of the four nitrogenous bases, including in dna adenine, thymine, and guanine, and in rna adenine, uracil, and guanine.
Transversion A mutation in which a pyrimidine is substituted for a purine or vice versa. See transition.
Triploid A cell (or organism) having three haploid copies of the genome.
Trisomy having three copies of a single chromosome ...
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.
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) ...
Nitrogenous bases. The purines (adenine and guanine) and pyrimidines (thymine, cytosine, and uracil) that comprise DNA and RNA molecules.
transition A type of point mutation in which one purine or pyrimidine is replaced by another base of the same type. Examples: A-G and C-T.
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 ...
Nucleotides contain a (purine or pyrimidine) base attached to a sugar (ribose or deoxyribose) and phosphate (PO4 =). The four bases in DNA code for all our genetic information and therefore for all the proteins we make.
Nucleoside 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)).
 See also: DNA, Base, Nucleotide, Purine, Molecule
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