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The eukaryotic ribosome is 80S. what does this ‘S’ denote?

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The eukaryotic ribosome is 80S. what does this ‘S’ denote?

(a) Supernatant coefficient

(b) Segregation coefficient

(c) Solidification coefficient

(d) Sedimentation coefficient

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My query is from Eukaryotic Cells and it’s Organelles topic in chapter Cell : The Unit of Life of Biology – Class 11

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Right answer is (d) Sedimentation coefficient

The explanation: The ‘S’ in 80S ribosome, or Svedberg’s Unit, stands for sedimentation coefficient. The sedimentation coefficient (S) of a particle characterizes the rate of sedimentation during centrifugation.

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