Guanine (G)

Definition

Guanine is one of the four nucleobases in the nucleic acids DNA and RNA. It pairs with cytosine (C) through three hydrogen bonds.

Related terms

Adenine (A):

This is another nucleobase found in DNA and RNA that pairs with thymine in DNA or uracil in RNA.

Nucleotide:

The basic building block of nucleic acids such as DNA and RNA. A nucleotide consists of a sugar molecule attached to a phosphate group and a nitrogen-containing base (like guanine).

Base Pairing: The process by which nitrogenous bases form hydrogen bonds during the formation of molecules like DNA or RNA. For example, guanine forms three hydrogen bonds with cytosine.