What is the size of the mitochondrial ribosome?

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Multiple Choice

What is the size of the mitochondrial ribosome?

Explanation:
Mitochondrial ribosomes are smaller than cytoplasmic ribosomes and reflect their prokaryotic ancestry, with a total size of about 55S on the Svedberg scale. This 55S ribosome is made up of a large 39S subunit and a small 28S subunit. In contrast, eukaryotic cytoplasmic ribosomes are 80S (40S small plus 60S large), and bacterial ribosomes are around 70S. The 55S size thus best matches the mitochondrion’s bacterial-like origin and its distinct ribosomal structure, making it the correct choice.

Mitochondrial ribosomes are smaller than cytoplasmic ribosomes and reflect their prokaryotic ancestry, with a total size of about 55S on the Svedberg scale. This 55S ribosome is made up of a large 39S subunit and a small 28S subunit. In contrast, eukaryotic cytoplasmic ribosomes are 80S (40S small plus 60S large), and bacterial ribosomes are around 70S. The 55S size thus best matches the mitochondrion’s bacterial-like origin and its distinct ribosomal structure, making it the correct choice.

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