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A class of nitrogenous compounds containing one heterocyclic ring. Two pyrimidines, cytosine and thymine, commonly are found in DNA; in RNA, uracil replaces thymine. (Figure 4-2) ...

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.

Pyrimidines are nitrogen containing organic bases. They are some of the building blocks of DNA and RNA.
View Dr Chromo's lecture on 'DNA'.

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.

Pyrimidines and Purines
Miss Crimson: Yes, Professor, I'm sure DNA transcription is very interesting, but let's stick to the basic characteristics of DNA that pertain to the trial at hand. You were telling us about the nitrogenous bases.
Cytosine bonds with guanine and adenine bonds with thymine ...

Pyrimidine dimers
Covalent bonds formed between two adjacent pyrimidines on the same strand of DNA induced by Ultraviolet irradiation.

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 ...

A nitrogenous base, such as cytosine, thymine, or uracil, with a characteristic single-ring structure; one of the components of nucleic acids.

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).
recessive the allele overshadowed by the dominant allele.

pyrimidine /pə-RIM-ə-deen/ One of the two types of nitrogenous bases occurring in nucleic acids. Pyrimidines are composed of a six-member heterocyclic ring of carbon and nitrogen atoms. The pyrimidines occurring in DNA are cytosine and thymine. In RNA they are cytosine and uracil.

Pyrimidine - One of two categories of nitrogen base ring compounds found in DNA and RNA. A six-membered ring containing two nitrogens. See purine.

A nitrogen-containing, single-ring, basic compound that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine; in RNA, cytosine and uracil.
See also: base pair
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[edit] Pyrimidine ribonucleotides
The synthesis of UMP.
The color scheme is as follows: enzymes, coenzymes, substrate names, inorganic molecules ...

Pyrimidines (single ring of C and N - smaller)
Thymine or Cytosine
Base pairing by weak hydrogen bonds ...

Pyrimidines have a single six-membered ring.
There are three different pyrimidines: cytosine (C), thymine (T), and uracil (U).
Purines have a six-membered ring joined to a five-membered ring.

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.
Pyrrhophyta A division of protists commonly termed the dinoflagellates.

Uracil a pyrimidine nitrogenous base that is found in RNA
Urea the main nitrogenous waste product of mammals
Urine an aqueous solution produced by the kidneys in mammals, that contains urea, inorganic salts and water.

Uracil is a pyrimidine base (nitrogenous base) and constituent of nucleotides and as such one member of the base pair A-U (adenine-uracil). It is normally found in RNA but not DNA.

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.

See also: base pair (ORNL)
A nitrogen-containing, single-ring, basic compound that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine; in RNA, cytosine and uracil.
See also: base pair (ORNL) ...

Thymine, Uracil and Cytosine all have a single ring structure and are classified as Pyrimidines.
Their molecules look like this:
When the base pairs form, a consistent spacing is obtained between the polynucleotide chains.

Both purines and pyrimidines are flat in the ring plane. The upper and lower surfaces of the rings are hydrophobic, while the edges are hydrophilic.
This means that the same factors that favor the assembly of lipids into membranes are involved in nucleic acid structure.

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. See Nitrogen fixation. Nontarget organism.

base pair a pair of hydrogen-bonded nitrogenous bases (one purine and one pyrimidine) that join the component strands of the DNA double helix.

In twofold degenerate sites, the equivalent nucleotides are always either two purines (A/G) or two pyrimidines (C/U), so only transversional substitutions (purine to pyrimidine or pyrimidine to purine) in twofold degenerate sites are nonsynonymous.

The binding of the two chains is between their nitrogen-containing bases and it always obeys the following rules: adenine (A), a purine base, binds with thymine (T), a pyrimidine base, and guanine (G), a purine base, binds to cytosine (C), a pyrimidine base.

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 table shows the pyrimidine/purine ratio at position '2 in cancers for which the AID/APOBEC mutational signature has been associated with AID/APOBEC expression [30],[31],[33],[58]. The expression of the various AID/APOBECs has been taken from Lin et al.[58] for the ESCC, and from Burns et al.

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:
A nitrogen-containing, single-ring, basic compound (cf. nitrogenous base) that occurs in nucleic acids.

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.

The other difference that you'll see in the structure of the nucleotides is that it uses the same guanine and adenine and cytosine that DNA uses but instead of using thymine uses a particular kind of pyrimidine called uracil.

(Science: biochemistry) A pyrimidine base found in dna and rna that pairs with guanine.
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.

Thymine and Cytosine are pyrimidines as they only have one ring in their molecular structure. A purine will link with a pyrimidine. Adenine and thymine link together by forming two hydrogen bonds while Guanine and cytosine link together by forming 3 hydrogen bonds.

- A base-pair substitution mutation resulting in the replacement of one purine by another purine or of one pyrimidine by another pyrimidine
- The process of biosynthesis of a polypeptide chain using genetic instructions from the mRNA ...

Base pair. A pair of nitrogenous bases (usually one purine and one pyrimidine) held together by hydrogen bonds in a double-stranded region of nucleic acid molecule. Commonly used interchangeably with nucleotide pair. Normal base pairs in DNA are
A-T and G-C; in RNA, A-U and G-C.

Steric constraints lead imatinib to adopt a compacted horseshoe shape that partially extends into the solvent, and the isoalloxazine ring of the NQO2 flavin cofactor in the active site stacks with the pyridine and pyrimidine rings of imatinib.

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) ...

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.

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)). The link is through the 1' carbone atom in ribose or deoxyribose.

Compounds consisting of a purine (adenine or guanine) or pyrimidine (thymine or cytosine) attached to ribose (in RNA) or deoxyribose (in DNA) at the 11 carbon. Nucleoside analogueSynthetic nucleosides that are similar to nucleosides but differ at a key location.

See also: See also: DNA, Nucleotide, Base, Purine, Molecule

Biology  Pyrenoid  Pyrococcus abyssi

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