The Chemistry of DNA: Life’s Blueprint in Molecules

DNA, or deoxyribonucleic acid, is the molecule that stores genetic instructions for life.
Its famous double-helix structure looks like a twisted ladder made of chemical bases.
The four bases—adenine, thymine, cytosine, and guanine—pair up in a precise code.
Hydrogen bonds hold the base pairs together, making DNA both stable and flexible.
The sequence of bases acts like letters in an alphabet, spelling out genes.
DNA’s sugar-phosphate backbone provides structure and protection for the code inside.
When cells divide, enzymes copy DNA so the blueprint passes to new cells.
Mutations—small changes in DNA—drive evolution but can also cause disease.
DNA is so compact that all of your genetic code fits inside nearly every cell.
Understanding DNA’s chemistry powers breakthroughs in medicine, forensics, and biotechnology.