Cytosine in Biological Definition

DNA

... by the identity of their bases. These are adenine (A), thymine (T), cytosine (C), and guanine (G). In a DNA double helix, two polynucleotide ... for particular pairs of nucleotides -- adenine and thymine, guanine and cytosine -- the two nucleotides are always present in equal proportions. ...

Anticodon

... protein synthesis . The first base on the anticodon can be modified to another nucleotide such as inosine which allows that base to pair with cytosine , adenine , and uracil on the codon. The first base on the anticodon can also have a uracil which can base pair with guanine as well as ....

Genetic code

... and pyrimidine . The purine bases adenine ( A ) and guanine ( G ) are larger and consist of two aromatic rings . The pyrimidine bases cytosine ( C ) and thymine ( T ) are smaller and only consist of one aromatic ring. In RNA however, thymine ( T ) is substituted by uracil ( U ) and the ...

DNA sequence

... DNA molecule or strand, The possible letters are A , C , G , and T , representing the four nucleotide subunits of a DNA strand ( adenine , cytosine , guanine , thymine ), and typically these are printed abutting one another without gaps, as in the sequence AAAGTCTGAC. This coded sequence is ...

Double helix

... Crick in 1953. They showed that DNA is made up of two complementary, antiparallel strands of the bases Guanine , Adenine , Thymine , and cytosine , covalently linked through phosphodiester bonds . Each strand forms a helix, and the two helices are held together through hydrogen bonds , ...

Genetic code

... and pyrimidine . The purine bases adenine ( A ) and guanine ( G ) are larger and consist of two aromatic rings . The pyrimidine bases cytosine ( C ) and thymine ( T ) are smaller and only consist of one aromatic ring. In RNA however, thymine ( T ) is substituted by uracil ( U ) and the ...

Nucleoside

... Deoxyguanosine dG Thymine Thymidine T Deoxythymidine dT Uracil Uridine U Deoxyuridine dU cytosine Cytidine C Deoxycytidine dC Nucleosides are glycosylamines made by attaching a nucleobase to a ribose ring. Examples of ...

Nucleotide

... a ribonucleotide (r) or deoxyribonucleotide (d). The second letter indicates the nucleobase: G: Guanine A: Adenine T: Thymine C: cytosine U: Uracil not present in DNA, but takes the place of Thymine in RNA The third and fourth letters indicate the length of the attached ...

Polymerase chain reaction

... corresponding to the amino acid isoleucine might be "ATH", where A stands for adenine , T for thymine , and H for adenine , thymine , or cytosine . (See genetic code for further details about codons ) Use of degenerate primers can greatly reduce the specificity of the PCR amplification. The ...

Primer

... corresponding to the amino acid isoleucine might be "ATH", where A stands for adenine , T for thymine , and H for adenine , thymine , or cytosine . (See genetic code for further details about codons ) Use of degenerate primers can greatly reduce the spesificity of the PCR amplification. The ...

Purine

... acids , adenine and guanine , are purines. In DNA , these bases form hydrogen bonds with their complementary pyrimidines thymine and cytosine . purine pyrimidine A T G C In RNA , the complement of A is uracil instead of thymine: purine pyrimidine A ...

Pyrimidine

... and that contains two nitrogen atoms at positions 1 and 3 of the six-membered ring. Three nucleobases found in nucleic acids , namely cytosine , thymine , and uracil , are pyrimidine derivatives. In DNA and RNA , these bases form hydrogen bonds with their complementary purines . ...

RNA

... or "RNA genes" 5.3 Double-stranded RNA 6 See also Chemical structure RNA has four different bases: adenine , guanine , cytosine , and uracil . The first three are the same as those found in DNA, but uracil replaces thymine as the base complementary to adenine. This may be ...

Wobble base pair

... the first base of the anti-codon. One important modified base is inosine which can basepair with three bases including uracil , adenine , and cytosine . Another critical base pair is the G-U base pair which allows uracil to base pair with two bases: guanine and adenine . Links ...