They are derivatives of → purine
These are structural elements of DNA that carry the genetic code
In DNA, adenine and guanine are attached to deoxyribose:
Thus, for example adenidine and guanidine are structural elements of DNA. These structural elements are linked by phosphate groups to form DNA chains:
Portion of DNA (Reading from 5 ' to 3' ): Adenine - Guanine
They are derivatives of → pyrimidine
These are the structural elements of DNA that carry the genetic code
In DNA, thymine and cytosine are attached to the deoxyribose:
These structural elements are linked by phosphate groups to form DNA chains:
DNA portion (Reading from 5' to 3 ): Thymine - Thymine - Cytosine
The bases of two DNA chains couple together by hydrogen bonds as follows:
DNA is thus presented as double chains of several billion pairs of coupled bases
The sequence of pairs of bses determines the genetic code
The double chain finally turns into a double helix:
