Ribosomes:

Ribosomes are tiny granular structures that are either floating freely in the cytoplasm or are bound to the Endoplasmic reticulum.

Structure of Ribosomes:

Each ribosome is made up of an almost equal amount of proteins and ribosomal RNA (rRNA). Ribosomes are not bound by membranes and so are found in Prokaryotes.

The function of Ribosomes:

Eukaryotic ribosomes are slightly larger than Eukaryotic ones. Ribosomes are the sites for protein synthesis where the message carried by mRNA is translated into proteins. Protein synthesis is extremely important to cells, and so a large number of ribosomes are found throughout cells (often numbering in hundreds and thousands). Ribosomes disassemble in two subunits when not involved in protein synthesis.