To label amino acids within cells, researchers "pulsed" E. coli with radioactive sulfate and "chased" with a large excess of nonradioactive sulfate. They observed that radioactivity was first associated with ribosomes and then later with completed proteins. The biologists concluded that _____.

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amino acids are randomly assembled into proteins

  

polypeptides are made in the nucleus

  

proteins are synthesized by ribosomes and are subsequently released

  

ribosomes break down proteins into amino acids

 

asked Dec 27, 2012 in Biology by anonymous
    

1 Answer

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proteins are synthesized by ribosomes and are subsequently released

 

answered Dec 27, 2012 by anonymous

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