The ribosomes of prokaryotic cells are smaller than the ribosomes of eukaryotic cells.If centrifuged sedimentation will take place at a different centrifugation speed because of their different sizes.The eukaryotic ribosomes are therefore designated as 80S ribosomes and prokaryotic ribosomes are 70S ribosomes.The diameter of a prokaryotic ribosome is approximately 18nm compared to the 22nm eukaryotic ribosomes.Ribosomes are the site of protein synthesis.Larger ribosomes can assemble larger and more complex proteins.
Ribosomes
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Specification: OCR Biology A (H020), AS-level, 2.1.1 Cell structure. Topic: Cell Structure.
Key terms in this lesson
- prokaryotic cell
- A cell with no nucleus or membrane-bound organelles, found in bacteria.
- eukaryotic cell
- A cell with a nucleus and membrane-bound organelles, found in animals, plants, fungi and protoctists.
More in Cell Structure
- Vacuole
- Chloroplasts
- Prokaryotic Cells
- DNA
- Cell Wall
- Flagella
- The Theory of Endosymbiosis
- Comparison with Eukaryotic Cells
All 26 lessons in Cell Structure · All OCR AS-level Biology topics