Discussion
In eukaryotic cells, ribosomes are
Answer: C
Correct answer: 80S
Eukaryotic cytoplasmic ribosomes are 80S, made of 60S and 40S subunits; prokaryotic ones are 70S, of 50S and 30S. The S is a Svedberg sedimentation coefficient, which is why the subunit values do not add up arithmetically. The difference is what lets antibiotics such as streptomycin and tetracycline attack bacterial ribosomes without harming ours - though mitochondria, having 70S ribosomes of their own, are not entirely spared.
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