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DNA: deoxyribonucleic acid

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.

(move it to beter appreciate the helical shape)

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 ).