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Ribosomes

Ribosomes produce and assemble all the proteins in the cell. All cells, even very simple ones like bacteria, have ribosomes.

Ribosomes are embedded in the endoplasmic reticulum.
Ribosomes are embedded in the endoplasmic reticulum.

Ribosomes are composed of very large proteins and ribosomal RNA. A ribosome does not have a membrane and therefore is not an organelle.

  • Membrane-bound ribosomes are attached to the rough endoplasmic reticulum. They produce proteins used in organelles or outside the cell.
  • Ribosomes give rough endoplasmic reticulum its rough appearance.

  • Free ribosomes float freely in the cell. They produce proteins used within the cell.