Science Dictionary
transformation   (trāns'fər-mā'shən)  Pronunciation Key 
  1. The genetic alteration of a bacteria cell by the introduction of DNA from another cell or from a virus. Plasmids, which contain extrachromosomal DNA, are used to transform bacteria in recombinant DNA research.

  2. The change undergone by an animal cell upon infection by a cancer-causing virus.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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