Here's why:
* Ribosomes are the protein factories of the cell. They translate genetic information from messenger RNA (mRNA) into the sequence of amino acids that make up proteins.
* Cells that synthesize large amounts of protein need many ribosomes to keep up with the demand.
* Ribosomes can exist freely in the cytoplasm or be attached to the endoplasmic reticulum (ER), forming rough ER.
* Cells actively engaged in protein synthesis often have a large amount of rough ER, which provides a surface area for ribosomes to attach and translate proteins.
While other organelles like the Golgi apparatus and the endoplasmic reticulum (both smooth and rough) are also involved in protein production and processing, the ribosomes are the primary site of protein synthesis.
