DNA replication and protein synthesis are both possible because of the double-helix structure.
James Watson, Francis Crick, and Rosalind Franklin discovered the double helix structure of DNA
A molecule of the DNA comprises two strands wound around each other where each strand contains a backbone comprising alternating groups of phosphate and sugar groups.
These two strands are held together by nitrogenous bases.
The twisted DNA unwinds and opens in these steps, allowing a copy of the DNA to be created.
The double helix shape of DNA is important as it helps in exact replication, where, each strand from the parent dictates to be on each new daughter strand.