Polyribosomes are found either free in the cytosol or attached to the endoplasmic reticulum. In general,"free" polyribosomes synthesize proteins that remain in the cell, such as hemoglobin in red blood cells or contractile proteins in muscle cells.

Where are polysomes found?

Polysomes are found either free in the cytoplasm or attached to the surface of membranes of the endoplasmic reticulum (ER) and the nucleus.

Are polysomes found in prokaryotes or eukaryotes?

In prokaryotic cells, the bacterial polysomes are in the form of double row structures and the ribosome is contacting each other within smaller subunits. In eukaryotic cells, the densely packed 3D helices and double row polysomes which are planar are found, which are similar to that of prokaryotic polysomes.