Cytosine

Cytosine is one of the four main building blocks of DNA, known as nucleotides. It is a chemical compound that pairs specifically with another nucleotide called guanine, forming part of the DNA double helix. Cytosine’s structure includes nitrogen atoms and a ring-shaped molecule, which allows it to bond tightly with guanine through hydrogen bonds. These pairings help encode genetic information, guiding how cells function and develop. Overall, cytosine is essential for storing and transmitting genetic data within living organisms.