Prokaryotic Regulation Inducible/Repressible and Positive/Negative Control Syste
ID: 219582 • Letter: P
Question
Prokaryotic Regulation Inducible/Repressible and Positive/Negative Control Systems Not all genes are expressed all the time, most are expressed only when the gene product (protein) is needed. .In order to control the abundance of these gene products, transcription is regulated Triggers non-proteins: tells when transcription is to occur. >Inducible System-the presence of the trigger s turns transcription Repressible System - the presence of the trigger cotersier turnstranscription Mechanisms-tells you how the DNA binding protein alters transcription ?Negative System. Binding of the protein to DNA-blavet??transcription - Positive System- Binding of the protein to DNA aiestranscription Positive Negative Inducer not present Inducer not present Inducible Isdus present Inducer present Corepressor not present: Repressible Corepressor present:Explanation / Answer
Above fill in the blanks is correct.
INDUCIBLE-
INDUCER PRESENT- The genes will be switched on. Repressor will be removed by the inducer from the regulator. (This is a positive control)
INDUCER ABSENT - The genes will be switched OFF. Repressor will remain bound to the regulator.
(This is a negative control)
Repressible-
Co-repressor PRESENT- The genes will be switched off. Co-repressor will bind to the aporepressor and block the regulator gene.
(This is a positive control)
Co-repressor ABSENT - The genes will be switched on. Aporepressor will not bind to the operator.
(This is a negative control)
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