These are so named because they contain high concentration of Ribonucleic acid (RNA). These small structures are sites of protein synthesis in all cell types prokaryotic as well as eukaryotic cells. Ribosomes are found freely dispersed in the cytoplasm in prokaryotic cells. But in eukaryotic cells they are found free as well as different kinds of proteins. There are millions of these per cell, and they are all identical. Ribosomes may be regarded as "Protein Factories". Under the directions of the nucleus they produce the protein needed by the cell. Each ribosomes consists of two unequal subunits.
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