Successive linkage of deoxyribonucleoside monophosphates forms a linear polymer called DNA. Its most stable form consists on two chains or strands associated by means of hydrogen bonds between nitrogenous bases, forming a double helix.
Joining the phosphorus
atoms with a fictitious green line, representing the backbone, allows to better observe the helical shape:
As for proteins, we can also use a simplified “cartoon” rendering
A G T C ).