Here's why:
* Ribosomes are the protein factories of the cell. They read the genetic code from messenger RNA (mRNA) and use that information to assemble amino acids into protein chains.
* mRNA is a copy of the gene's DNA sequence, carrying the instructions for building a specific protein.
* Ribosomes can be found either free-floating in the cytoplasm or attached to the endoplasmic reticulum (ER).
* Free ribosomes make proteins that will be used within the cell.
* Ribosomes attached to the ER synthesize proteins that will be secreted from the cell or used in membranes.
Let me know if you'd like more detail on the process of protein synthesis!