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en.wikipedia.org/wiki/Cytosine

Cytosine is one of the four main bases found in DNA and RNA, along with adenine, guanine, ... When found as the second base in a codon, the third is always interchangeable. For example, UCU ... Unnatural base pair (UBP) · Nucleoside ...

www.ncbi.nlm.nih.gov/Class/MLACourse/Original8Hour/Genetics/basepair.html

A base pair refers to two bases which form a "rung of the DNA ladder. ... In base pairing, adenine always pairs with thymine, and guanine always pairs with ...

www.biology-pages.info/B/BasePairing.html

A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T); C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G).

www.quora.com/In-DNA-does-Adenine-always-pair-with-Cytosine

Not so much "always" as "never". Adenine pairs with thymine and cytosine with guanine. Almost always - mis-pairings do occur, but distort the molecule and can  ...

www.genome.gov/dnaday/q.cfm?aid=5568&year=2006

Adenine and Thymine are always paired and Guanine and Cytosine are ... and " C" pairs with "G." So the question asks why does A pair with T. This is due to the ...

www.chegg.com/homework-help/questions-and-answers/dna-nucleotide-containing-cytosine-always-pairs-nucleotide-containing-guanine-adenine-cyto-q17941600

Answer to In DNA, the nucleotide containing cytosine always pairs with the nucleotide containing guanine adenine cytosine thymine ...

cs.boisestate.edu/~amit/teaching/342/lab/structure.html

Note that the purine bases (adenine and guanine) have a double ring ... You will see that a purine with two rings always pairs with a pyrimidine with one ring.

study.com/academy/lesson/dna-adenine-guanine-cytosine-thymine-complementary-base-pairing.html

DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing ..... the hydrogen-bonded nitrogenous bases are often referred to as base pairs.

www.ask.com/youtube?q=Cytosine+Always+Pairs+with&v=9G_EwNV8_Bw
Aug 25, 2017 ... As seen in the figure, two hydrogen bonds are formed between adenine and thymine, three cytosine guanine. Adenine always pairs if two ...