Individual chains of the DNA double helix are made up of molecules called nucleotides.

Here's a breakdown:

* DNA (Deoxyribonucleic acid) is made up of two long chains of nucleotides.

* Nucleotides are the building blocks of DNA. Each nucleotide is composed of:

* A sugar molecule (deoxyribose)

* A phosphate group

* A nitrogenous base (adenine, guanine, cytosine, or thymine)

These nucleotides are linked together in a specific order to form the chains of DNA. The two chains then twist around each other to form the famous double helix structure.