Here's a breakdown:

* Ribosomes: These 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: This molecule carries the genetic instructions from the DNA in the nucleus to the ribosomes in the cytoplasm.

* Amino acids: These are the building blocks of proteins. They are linked together in a specific sequence determined by the mRNA to create a protein.

So, the process of protein synthesis, where proteins are built, starts in the nucleus, where DNA is transcribed into mRNA. This mRNA then moves out to the cytoplasm, where it finds a ribosome. The ribosome reads the mRNA instructions and links together amino acids in the correct order to form a polypeptide chain. This chain then folds into a functional protein.