Question
Wed April 13, 2011 By: Utkarsh Singh

What are 70S and 80S Ribosomes?

Expert Reply
Thu April 14, 2011
The S is the Svedberg unit, used to express sedimentation coefficients of biomolecules and cell components. It is essentially an express of speed. The smaller the S value, the slower the molecule moves in a centrifuge. 
70S and 80S are two different terms that describe ribosomes. Prokaryotes have a 70S ribosome, made up of a 30S ribosomal subunit and a 50S ribosomal subunit. Eukaryotes have an 80S ribosome, made up of a 40S ribosomal subunit and a 60S ribosomal subunit. 
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