That statement is incorrect. The sides of a DNA molecule are made up of alternating sugar and phosphate groups.

Here's why:

* Sugars (deoxyribose): These form the backbone of each strand of DNA. They are linked together by phosphate groups.

* Phosphates: These are the negatively charged groups that connect the sugars. The phosphate backbone is what gives DNA its negative charge.

* Nitrogenous Bases: These are attached to the sugars and face inward towards the center of the helix. They form the rungs of the DNA ladder and are responsible for the genetic code.

So, the structure of DNA is like a twisted ladder:

* Sides: Sugar-phosphate backbone

* Rungs: Nitrogenous bases (adenine, guanine, cytosine, and thymine)