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Regulation of Gene

Regulation of Gene Expression

QuestionAnswer
o Define induction The process that turns on the transcription of a gene.
o Define repression. The process by which a repressor protein can stop the synthesis of a protein.
o What is an operon? The Operator and promoler sites and structural genes they control
How is an operon arranged? The operon consists of the promoter (P) and operator (0) sites and structural genes that code lor the protein. The operon is regulated by the product of the regulatory gene (I).
o Provide an example of an repressible operon. trp operon and the co-repressor of this operon is tryptophan.
o Provide an example of an inducible operon. lac operon and the inducer of this operon is lactose
Explain how repressible operon works • Tryptophan. an amino acid. Is produced by anabolic enzymes encoded by fIVe structural genes. Accumulation of tryptophan represses transcription of these genes. preventing further synthesis of tryptophan.
Explain how inducible operon works • Lactose-digesting enzymes are produced in th e presence of lactose. In E. call, the genes for the three enzymes are in the lac operon. B, -galactosidase,is encoded by lacZ. The lacY gene encodes the lac permease. and lacA encodes transacetylase,
What are the default positions of each operon?  The default position of a inducible gene is off.  The default position of a repressible gene is on.
Created by: xsavier1
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