Here's a breakdown:

* RNA stands for Ribonucleic Acid.

* Nucleotides are the building blocks of RNA.

* Each nucleotide is composed of three parts:

* A sugar molecule (ribose)

* A phosphate group

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

So, the sequence of nucleotides in an RNA molecule is what defines the specific RNA molecule and its function.