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| 3-D Model of Ribosomes. These have two subunits. Ribosomes are involved in Protein Synthesis. | Groups of Ribosomes are called Polysomes. Polysomes can occur free in the cytoplasm. |
| The ribosomes in chloroplasts and mitochondria are smaller than those in the cytoplasm. These small ribosomes are similar to those in bacteria. This supports the Endosymbiotic theory of organelle evolution. | |
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