Ribosomes that occur exclusively in mitochondria are

70S

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55S

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30S

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80S

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Solution

The correct option is B 55S
Ribosomes are cell organelles which carry out protein synthesis. Prokaryotes have 70S ribosomes and eukaryotes have 80S ribosomes. Ribosomes are found freely in cytoplasm as wells in or attached to some organelles.
Mitochondria have 55S ribosome. They have small 28S and large 39S subunits which together form 55S mitoribosome (mitochondrial ribosome).
So the correct answer is " 55S ".

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