Here's a breakdown:

* Ribosomes are small organelles found in all living cells. They are the sites of protein synthesis.

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

* tRNA (transfer RNA) brings amino acids to the ribosomes, where they are linked together in the order specified by the mRNA.

* The ribosome moves along the mRNA, reading the code and linking amino acids together to form a polypeptide chain.

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

So, while DNA contains the blueprint for proteins, the actual construction of the protein molecules occurs at the ribosomes.