DNA contains all the instructions needed to grow and develop from a fertilised egg to a fully grown adult.
The DNA molecules are very long and are coiled up very tightly, so a lot of genetic information can fit into a small space.
DNA molecules have a paired structure, which makes it easier to copy itself. This is called self-replication.
It's important for cell division and for passing genetic information through generations.
The double-helix structure means DNA is very stable in the cell.
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