Here's a breakdown:

* Ribosomes are complex molecular machines found in all living cells. They are composed of ribosomal RNA (rRNA) and proteins.

* mRNA (messenger RNA) carries the genetic code from DNA in the nucleus to the ribosome.

* tRNA (transfer RNA) brings individual amino acids to the ribosome, where they are added to the growing polypeptide chain based on the mRNA sequence.

* The ribosome reads the mRNA sequence and uses it to link the amino acids together, forming a protein.

So, while the DNA in the nucleus contains the instructions for protein synthesis, the ribosome is the physical location where the actual synthesis of proteins takes place.