Chemical structure of guanine, showing its double-ring purine structure and the functional groups involved in hydrogen bonding with cytosine. (Image: Public Domain) Guanine has the chemical formula ...

The original model of DNA structure created by Crick and Watson ... There are four types of base - adenine, thymine, cytosine and guanine. All human cells contain DNA. The 3 billion pairs of ...

In the double helix structure of DNA, thymine forms a base pair with adenine through two hydrogen bonds. This specific pairing is known as complementary base pairing and is essential for the stability ...