What are Ribosomes???

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.

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