What are Ribosomes???
* Granular structures, first observed by George Palade under an electron microscope
* Composition: RNA and proteins
* Not surrounded by any membrane
* Prokaryotic cells have ribosomes 70SE. Eukaryotic ribosomes are 80S. S stands for Svedberg unit, and is indicative of density and size.
Ribosome plays a very important role in prtoein synthesis.