Ribosomes

Question

70S ribosomes are characteristically found in which cellular compartment of eukaryotes?

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1. **Ribosome Types**: Prokaryotes have $70S$ ribosomes, while the eukaryotic cytoplasm contains $80S$ ribosomes.
2. **Organelle Ribosomes**: Curiously, semi-autonomous organelles like **Mitochondria** and **Chloroplasts** have their own DNA and their own **$70S$ ribosomes**.
3. **Endosymbiotic Theory**: This provides evidence that these organelles originated from ancestral prokaryotic cells that were engulfed by a host cell.
4. **Protein Synthesis**: Having their own ribosomes allows these organelles to synthesize some of their own proteins independently of the nuclear genome.

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Ribosomes

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