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What (who) is cytosine - definition
CHEMICAL COMPOUND
Cytosine nucleotides; Cytosin
cytosine
['s??t?si:n]
¦ noun Biochemistry a compound found in living tissue as a constituent base of DNA and RNA.
TRNA (cytosine-5-)-methyltransferase
CLASS OF ENZYMES
EC 2.1.1.29; S-adenozil-L-metionin:tRNA (cytosine-5-)-methyltransferase
In enzymology, a tRNA (cytosine-5-)-methyltransferase () is an enzyme that catalyzes the chemical reaction
Multisite-specific tRNA:(cytosine-C5)-methyltransferase
CLASS OF ENZYMES
EC 2.1.1.202; Multisite-specific tRNA:m5C-methyltransferase; TRM4 (gene); TRM4; S-adenosyl-L-methionine:tRNA (cytosine-C5)-methyltransferase; S-adenozil-L-metionin:tRNA (cytosine-C5)-methyltransferase
Multisite-specific tRNA:(cytosine-C5)-methyltransferase (, multisite-specific tRNA:m5C-methyltransferase, TRM4 (gene)) is an enzyme with systematic name S-adenosyl-L-methionine:tRNA (cytosine-C5)-methyltransferase. This enzyme catalyses the following chemical reaction
Wikipedia
Cytosine
Cytosine () (symbol C or Cyt) is one of the four nucleobases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2). The nucleoside of cytosine is cytidine. In Watson-Crick base pairing, it forms three hydrogen bonds with guanine.
Examples of use of cytosine
1. Normal DNA consists of four bases _ adenine, cytosine, guanine and thymine (known as A,C,G,T) _ molecules that spell out the genetic code in pairs.
2. Each chromosome is made up of a molecule of DNA in the shape of a double helix which is composed of four chemical bases represented by the letters A (adenine), T (thymine), G (guanine) and C (cytosine). The arrangement, or sequence, of the letters determines the cell‘s genetic code.