Repression

Repression (inactivation) of certain sugar-metabolizing operons (eg lac) in favour of glucose utilization when glucose is the predominant carbon source in the environment of the cell.
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Repression
Switching off the expression of a gene or a group of genes in response to a chemical or other stimulus.
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REPRESSION - Inhibition of transcription (or translation) by the binding of a repressor protein to a specific site on DNA (or mRNA).
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Repression: A form of gene regulation wherein the promoter is prevented from assembling an RNA polymerase complex, so that transcription does not occur.
Resolution: Degree of molecular detail on a physical map of DNA, ranging from low to high.
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The repression proteins break down the mRNA by
removing its "cap"
removing its poly(A) tail
degrading the remaining message (nibbling away in the 5' -> 3' direction) ...
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As expected, disruption of fur also resulted in derepression of genes putatively involved in siderophore biosynthesis and iron uptake.
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Many militia members believed that the year 2000 would lead to political and personal repression enforced by the United Nations and countenanced by a compliant U.S. government.
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But clearly we have examples where you have both activation and repression in this process. And that's common to all biological processes. The whole concept that you need both activation and repression is a common theme throughout biology.
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Seventy-five different operons controlling 250 structural genes have been identified for E. coli. Both repression and induction are examples of negative control since the repressor proteins turn off transcription.
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A repressor is a DNA-binding protein that regulates the expression of one or more genes by decreasing the rate of transcription. This blocking of expression is called repression.
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repression A decrease in the expression of a gene in response to a regulatory protein. repressor The protein that binds to the regulatory sequence of a gene, blocking its transcription.
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X-inactivation -- the repression of one of the two X-chromosomes in the somatic cells of females as a method of dosage compensation; at an early embryonic stage in the normal female, one of the two X-chromosomes undergoes inactivation, ...
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