Here's why:

* DNA Structure: DNA is a double helix, like a twisted ladder. The sides of the ladder are made up of sugar and phosphate molecules.

* Nucleotides: The rungs of the ladder are made up of nucleotides. Each nucleotide consists of:

* A sugar molecule (deoxyribose)

* A phosphate group

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

* Sequence: The specific order of these nucleotides along the DNA strand is what makes up the genetic code.

So, a DNA molecule is basically a long chain of thousands of nucleotides linked together!