Final answer:
Ribosomes are found in practically every cell, but the number can vary based on the cell's protein synthesis needs. Muscle cells may have fewer ribosomes compared to pancreatic cells.
Step-by-step explanation:
Ribosomes are found in practically every cell because protein synthesis is an essential function. However, the number of ribosomes can vary between different cell types depending on their protein synthesis needs. Muscle cells, which do not export digestive enzymes, may have fewer ribosomes compared to pancreatic cells, which produce and export large amounts of digestive enzymes.