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What does 'S' refer in a 70S and 80S rib...

What does 'S' refer in a 70S and 80S ribosome?

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S' refers to Svedbergs unit for sedimentation coefficient. Sedimentation coefficient depicts that how fast a cell organelle sediments during the ultracentrifugation, In cells heavier the structure, higher is the sedimentation coefficient. The value of S is equal to `10^(-13)" seconds "(1 s = 1xx1=^(-13)" seconds)"`.
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