When students learn about cell biology, they learn all about the nucleus, DNA, RNA, and ribosomes. In other words they learn about how the cell works and how DNA is the blueprint for all the proteins. The proteins do all the work for the cell. Unfortunately the DNA is contained in the nucleus of the cell and cannot get to the ribosomes, which must read the blueprints in order to make the protein. A copy of the DNA is thus made, called RNA, and the RNA leaves the nucleus and goes to the ribosomes, and that is how a protein can be made. An episode of NOVA scienceNOW shows a recent discovery on how this process works. A new chemical called RNAi evidently is found in cells. This chemical evidently stops foreign mRNA (messenger RNA) from a virus or bacteria from being read by the ribosomes. The site has an excellent video about the discovery of RNAi and how it works.
NOVA | scienceNOW | RNAi | PBS
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