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Figure 4.3. Prokaryotic and eukaryotic types of ribosomes.

Figure 4.3. Prokaryotic and eukaryotic types of ribosomes.

ribosomes. The absolute content of ribosomal RNA per particle is also significantly lower. That is why they are sometimes called "mini-ribosomes". The sedimentation coefficient of mini-ribosomes from mammalian mitochondria is only about 55S, and the total mass of ribosomal RNA per particle is about two-thirds of that in typical 70S ribosomes. At the same time, mammalian mitochondrial ribosomes contain a high proportion of protein, so their total size does not seem to differ greatly from that of prokaryotic ribosomes. On the whole, despite some unusual features mammalian mitochondrial ribosomes are similar to prokaryotic 70S ribosomes in some of their characteristics, including functional ones.

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