Lentils or peas are commonly used to represent the ribosome as they were about the same size.
A ribosome is a small, dense granular particle comprising usually three or four ribosomal RNA molecules and more than 50 protein molecules, interconnected to form the site of protein synthesis.
Ribosomes occur in both prokaryotic and eukaryotic cells. A ribosome can be thought of as a giant enzyme that builds proteins from a set of genetic instructions. It is the cellular structure responsible for decoding your DNA.
Learn more about ribosome including structure, function and location at Study.com.