Ribosomes are small, non-membrane bound organelles that are found in all cells, both prokaryotic and eukaryotic. They play a crucial role in the process of protein synthesis, also known as translation.In eukaryotic cells, ribosomes can be found in two different locations: the cytoplasm and the endoplasmic reticulum (ER). Cytoplasmic ribosomes are free-floating and are not associated with any particular organelle. They are responsible for synthesizing proteins that are destined for use within the cell or for secretion outside of the cell. On the other hand, ribosomes that are located on the ER, also called as rough endoplasmic reticulum (RER) are responsible for synthesizing proteins that are destined to be transported out of the cell.In prokaryotic cells, such as bacteria, ribosomes are found throughout the cytoplasm. They are responsible for synthesizing all of the proteins needed by the cell for its survival and growth.Ribosomes are composed of two subunits, a large subunit and a small subunit, which come together to form the active site for protein synthesis. These subunits are made up of both proteins and ribosomal RNA (rRNA). The composition of these subunits varies between prokaryotic and eukaryotic cells, but the overall structure and function of ribosomes is highly conserved across all organisms.In conclusion, ribosomes are small, non-membrane bound organelles that are found in all cells and play a crucial role in the process of protein synthesis. In eukaryotic cells, they can be found in two different locations, the cytoplasm and the endoplasmic reticulum. In prokaryotic cells, such as bacteria, ribosomes are found throughout the cytoplasm. They are composed of two subunits, a large subunit and a small subunit, which come together to form the active site for protein synthesis.