Here's why:

* Ribosomes are the protein synthesis factories of the cell. They read the genetic code from messenger RNA (mRNA) and use that information to assemble amino acids into proteins.

* mRNA is a copy of a gene from the DNA. It carries the instructions for building a specific protein.

* tRNA molecules bring the correct amino acids to the ribosome based on the mRNA code.

* The ribosome moves along the mRNA, adding amino acids one by one. This process continues until the ribosome reaches a "stop" signal in the mRNA, and the complete protein is released.

While other cellular components are involved in protein production (like DNA, mRNA, tRNA, and enzymes), the ribosome is the primary site of protein synthesis.