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Prokaryotic ribosomes are described as

  • A.80S, with 60S and 40S subunits
  • B.70S, with 60S and 40S subunits
  • C.80S, with 50S and 30S subunits
  • D.70S, with 50S and 30S subunits

Answer: D

The Svedberg values describe sedimentation rather than mass, which is why the subunits do not sum arithmetically to the whole. The difference from the eukaryotic 80S ribosome is what several classes of antibiotic exploit for their selectivity.

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