Here's a breakdown:

* DNA in the nucleus contains the genetic code for making proteins.

* This code is transcribed into messenger RNA (mRNA), which carries the instructions to the ribosomes.

* Ribosomes are tiny organelles found in the cytoplasm (the fluid inside the cell). They act like factories, reading the mRNA code and linking amino acids together in the correct order to build a protein.

So, the ribosomes are the site of protein synthesis.