cytosine
Noun
Meaning
a base found in DNA and RNA and derived from pyrimidine; pairs with guanine
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A base is attached to the 1' position, in general, adenine (A), cytosine (C), guanine (G), or uracil (U).
Adenine pairs with thymine (two hydrogen bonds), and guanine pairs with cytosine (stronger: three hydrogen bonds).
Adenine binds with thymine and uracil; Thymine binds only with adenine; and cytosine and guanine can bind only with one another.
Aspartate carbamoyltransferase performs a step in building the pyrimidine nucleotides ( cytosine and thymidine ).
DNA is first treated with sodium bisulfite, which converts unmethylated cytosine bases to uracil, which is recognized by PCR primers as thymine.
Bacteria also use DNA adenine methylation (rather than DNA cytosine methylation) as an epigenetic signal.