Here's a breakdown:

* Ribosomes are complex molecular machines found in all living cells. They are responsible for translating the genetic code from messenger RNA (mRNA) into a chain of amino acids, which then folds into a functional protein.

* mRNA carries the genetic instructions from the DNA in the nucleus to the ribosomes.

* The ribosomes read the mRNA and use it as a template to assemble amino acids into a specific order, creating a polypeptide chain.

* This polypeptide chain then folds into a three-dimensional structure, becoming a functional protein.

So, while the genetic instructions for proteins originate in the DNA within the nucleus, the actual protein synthesis occurs at the ribosomes.