Cytosine (C)
Definition
Cytosine is another one of the four nitrogenous bases found in both DNA and RNA molecules. In both cases, it pairs with guanine (G).
Analogy
Consider cytosine as a puzzle piece. It can only fit perfectly with its corresponding piece - guanine.
Related terms
Guanine (G): The nitrogenous base that pairs with cytosine in both DNA and RNA.
Pyrimidines: A type of nitrogenous base that includes cytosine, thymine, and uracil. They are single-ringed structures.
Purines: A type of nitrogenous base that includes adenine and guanine. They are double-ringed structures.
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