The organelle where amino acids link together to form proteins is the ribosome.

Here's why:

* Ribosomes are the protein synthesis factories of the cell. They read the genetic code carried by messenger RNA (mRNA) and use that information to assemble amino acids in the correct order to build a protein.

* Amino acids are the building blocks of proteins. They are linked together by peptide bonds to form long chains called polypeptides, which then fold into complex three-dimensional structures to become functional proteins.

So, the ribosome is the crucial organelle responsible for the linking of amino acids into proteins.