Here's a breakdown:

* Ribosomes are small, complex structures found in all living cells. They are responsible for translating the genetic code carried by messenger RNA (mRNA) into a chain of amino acids, which then fold into a functional protein.

* mRNA is a molecule that carries the genetic instructions from the DNA in the nucleus to the ribosome.

* Amino acids are the building blocks of proteins.

So, the ribosome reads the instructions on the mRNA and assembles the correct amino acids in the right order to build the protein.