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What is the difference in size between eukaryotic and prokaryotic ribosomes?

Options

  1. AEukaryotic ribosomes are larger than prokaryotic ribosomes
  2. BProkaryotic ribosomes are larger than eukaryotic ribosomes
  3. CEukaryotic and prokaryotic ribosomes are the same size
  4. DEukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S

Correct answer

D. Eukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S

Step-by-step solution

Explanation : The eukaryotic ribosomes are 80S while the prokaryotic ribosomes are 70S . Each ribosome has two subunits, larger and smaller subunits. The two subunits of 80S ribosomes are 60S and 40S while that of 70S ribosomes are 50S and 30S. Here ‘S’ (Svedberg’s Unit) stands for the sedimentation coefficient; it is indirectly a measure of density and size. Both 70S and 80S ribosomes are composed of two subunits.

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