Here's a breakdown:

* DNA is a double helix made up of two strands of nucleotides.

* Each nucleotide consists of:

* A sugar molecule (deoxyribose)

* A phosphate group

* A nitrogenous base: There are four types of nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T).

* The sequence of these bases along the DNA strand determines the genetic information. This sequence is like a code that instructs the cell on how to build and maintain the organism.

Think of it like this: A DNA strand is like a sentence, and the nucleotides are like the letters. The order of the letters determines the meaning of the sentence, just like the order of nucleotides determines the genetic instructions.