What are polysomes or polyribosomes?
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A polyribosome is a complex of an mRNA molecule and two or more ribosomes that act to translate mRNA instructions into polypeptides. Originally coined "ergosomes" in 1963, they were further characterized by Jonathan Warner, Paul M. Knopf, and Alex Rich.
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Polysome or polyribosome is a mRNA with two or more ribosomes. It aggregates ribosomes. It can be usually seen in prokaryotic cells. When seen in microscope, it is seen as beads on a string. It translates genetic or chemical information coded during protein synthesis. They are found on the rough endoplasmic recticulum. In bacteria, it floats in the cytoplasm. Throughout successful translation, it forms polypeptide chains. At one time, more than one ribosome will translate an mRNA, allowing the simultaneous development of many polypeptides from a single mRNA.
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