The Structure of DNA
DNA is often called the blueprint of life.
In simple terms, DNA contains the instructions for making proteins within the cell.
We study DNA for many reasons, e.g.,
its central importance to all life on Earth,
medical benefits such as cures for diseases,
better food crops.
Our genes are on our chromosomes.
Chromosomes are made up of a chemical called DNA.
DNA is a very long polymer.
The basic shape is like a twisted ladder or zipper.
This is called a double helix.
The DNA double helix has two strands twisted together.
The backbone of the molecule is alternating phosphates and deoxyribose sugar
The teeth are nitrogenous bases.
One deoxyribose together with its phosphate and base make a nucleotide.
One strand of DNA is a polymer of nucleotides.
One strand of DNA has many millions of nucleotides.
DNA has four different bases:
Two Kinds of Bases in DNA
Pyrimidines are single ring bases.
Purines are double ring bases.
Thymine and cytosine each have one ring of carbon and nitrogen atoms.