Cytosine
(Science: biochemistry) A pyrimidine base found in dna and rna that pairs with guanine.
Cytosine
Cytosine (C) is one of four chemical bases in DNA, the other three being adenine (A), guanine (G), and thymine (T).
Cytosine: A nitrogenous base. Pairs with guanine in DNA molecules.
DNA (deoxyribonucleic acid): the molecule that encodes genetic information. DNA is composed of two anti-parallel strands which wind about a common axis to form a double helix.
cytosine One of the pyrimidine nitrogenous bases occurring in both DNA and RNA. PICTURE ...
Cytosine
One of the four bases in DNA that make up the letters A, T, C, G. Cytosine is the "C". The others are adenine, thymine, and guanine. Cytosine always pairs with guanine. [Talking Glossary]
Deoxyribonucleic acid (DNA) ...
Cytosine (C) A nitrogenous base, one member of the base pair GC (guanine and cytosine) in DNA.
See also: base pair, nucleotide
Updated 26-Apr-07
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Cytosine (C)
Cytosine is a pyrimidne base (nitrogenous base) and constituent of nulceotides and as such one member of the base pair G-C (guanine and cytosine) .
Cytosine
These hydrogen bonding modes are for classical Watson-Crick base pairing.
cytosine A nitrogen base found in both DNA and RNA.
cytoskeleton In the cytoplasm of eukaryotic cells, an internal framework of microtubules, microfilaments, and intermediate filaments by which organelles and other structures are anchored, organized, ...
5-methylcytosine
thymine
Structure of cytosine with and without the 5-methyl group. Deamination converts 5-methylcytosine into thymine.
Hydroxymethyl cytosine
A modification of cystine residues. This modification is typical of some phage DNA. The modified DNA is resistant to certain restriction endonucleases.
PYRIMIDINE BASES - Cytosine (C), Thymine (T) or Uracil (U) (see NUCLEOTIDE).
A pair of complementary nitrogenous bases in a DNA molecule--adenine-thymine and guanine-cytosine. Also, the unit of measurement for DNA sequences. Bioaugmentation.
Base sequence -- a partnership of organic bases found in DNA and RNA; adenine forms a base pair with thymine (or uracil) and guanine with cytosine in a double-stranded nucleic acid molecule.
Cytosine Cytoskeleton CytosolThe fluid in which the organelles of the cytoplasm are suspended. Also called the ground substance of the cell. Cytotoxic T lymphocyte (CTL) D ...
These nucleotides are composed of a nitrogenous base (A = adenine, T = thymine, C = cytosine, G = guanine) attached to a sugar called deoxyribose and the sugar is attached to a phosphate group which is negatively charged.
He found it contained four nitrogenous bases: cytosine, thymine, adenine, and guanine; deoxyribose sugar; and a phosphate group.
An organic acid and polymer composed of four nitrogenous bases--adenine, thymine, cytosine, and guanine linked via intervening units of phosphate and the pentose sugar deoxyribose.
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).
Included in this group are the nucleoside analogs, chemicals that are similar to one of the bases (adenine, cytosine, guanine, and thymine) that comprise DNA, but sufficiently different enough to block viral DNA synthesis.
A post-replication process. Cytosine residues in CpG sequences are methylated, forming gene-specific methylation patterns. Methylation of promoter regions correlates with gene expression patterns.
Related
Chromatin Epigenetics ...
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.
Nucleotide: A molecular subunit of DNA or RNA consisti ng of a base (adenine, guanine, thymine, or cytosine in DNA; adenine, guanine, uracil, or cytosine in RNA). Thousands of nucleotides are linked to form a DNA or RNA molecule.
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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DNA methylation in vertebrates The addition of a methyl group to a cytosine base of a CpG dinucleotide to form 5-methylcytosine. in micro-organisms many other methylation positions may be used.
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.
ethyl-nitrosourea A nitrosoamine used as a chemical mutagen. Causes oxidative deamination of adenine and cytosine. Deamination of cytosine gives a C-G to T-A transition.
A nitrogenous base, such as cytosine, thymine, or uracil, with a characteristic single-ring structure; one of the components of nucleic acids.
Jeffrey Yoder et al "Cytosine methylation and the ecology of intragenomic parasites", Trends in Genetics, Aug 1997, vol 13, no. 8 [PubMed]
Acknowledgements ...
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) ...
Cpg islands Regions of DNA rich in the sequence cpg, usually located at the 5' region of genes; the cytosine bases of these islands can be methylated to inhibit transcription of the associated gene.
The two strands are held together by hydrogen bonds (electrostatic attraction). Two hydrogen bonds hold adenine to thymine. Three bonds attach cytosine to guanine as indicated in the diagram above.
DNA (deoxyribonucleic acid): The large double-stranded molecule carrying the genetic code. It consists of four bases (adenine, guanine, cytosine and thymine), phosphate and ribose.
 See also: DNA, Adenine, Guanine, Thymine, Molecule
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