In the preceding chapters there has often been some discussion about the use of a repressor to regulate transcription. Repressors are but one type of regulatory element commonly found in bacteria. This chapter expands on the role of the repressor and introduces many new regulatory elements. Implicit in the discussion that follows is the fact that protein and RNA molecules do not last indefinitely in the cell. Proteases and nucleases are produced that slowly degrade those molecules. It is this slow turnover of macromolecules that makes possible the gradual alteration of phenotypes.
KeywordsPolar Mutation cAMP Receptor Protein Endospore Formation Lactose Operon Tryptophan Operon
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