Genetic Theory

Nucleic Acids and Replication

  1. kokab786
  2. gcarrillo

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1.   Jan 23, 2008 8:04 PM

» kokab786 - difference b/w prokaryotes and eukaryotes


how does prokaryotes ribosomes become 70s rather than 80s when subunits are of 50s and 30s
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-- posted by kokab786

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2.   Feb 8, 2008 4:37 AM

» gcarrillo - difference b/w prokaryotes and eukaryotes

In response to difference b/w prokaryotes and eukaryotes posted by kokab786:


The S in 70S and 80S refers to Svedberg units, the sedimentation coefficient. This is a measure of how fast a cell organelle sediments in an ultracentrifuge. Heavier structures have higher sedimentation coefficient. Sedimentation coefficients are not additive. Thus the 30S and 50S subunits of a ribosome together make up a ribosome with a sedimentation coefficient of 70S and not 80S.

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-- posted by gcarrillo

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