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.
hydrogen bonds
Joining the phosphorus atoms with a fictitious green line, representing the backbone, allows to better observe the helical shape:
You may the molecule to watch it along its axis.
As for proteins, we can also use a simplified “cartoon” rendering ( A G T C ).