Ribosomes are small dot-like structures in cells.
Ribosomes are the site of protein synthesis in cells.
These molecules are arranged into two subunits called the large and small subunits. These subunits are attached to each other and together form the entire ribosome. When viewed through a light microscope the ribosomes appear as dots, they are very small and the subunits can not be seen. Function The only function of ribosomes is to build proteins. The plan for the protein in the form of mRNA passes through a groove in the ribosome.