18 Questions
What is the role of a repressor protein in gene regulation?
It binds to the operator and prevents transcription
What type of pathways are usually characterized by the presence of a gene product inhibiting gene expression?
Repressible pathways
What is the function of an activator protein in gene regulation?
It enhances the binding of RNA polymerase to the promoter
What is the role of the end product tryptophan in the anabolic pathway that leads to its synthesis?
It inhibits the gene expression
What is the term used to describe genes that are switched on in response to an external stimulus?
Inducible genes
What is the term for the molecule that binds to the repressor, enabling it to bind to DNA and cause repression of gene expression?
Corepressor
What is the role of an inducer molecule in gene regulation?
It binds to the repressor protein and inhibits its activity
What is the term used to describe the mechanism by which genes are turned off in response to an external stimulus?
Negative control mechanism
In negative regulation, what is the default state of RNA production?
It is active
What is the term used to describe the process of switching on and off gene expression in response to environmental changes?
Gene regulation
What is the term for the regulator molecule that directly stimulates RNA production in positive regulation?
Activator
What is the purpose of the inhibitor in gene regulation?
To prevent the activator from binding to DNA
What is the role of a small effector molecule in genetic regulatory proteins?
It brings about conformational changes in the regulatory protein
What type of enzymes are produced in response to the presence of lactose in E. coli?
Inducible enzymes
What is the role of regulatory proteins in gene expression?
To activate or block transcription
What is the term for the process by which the production of an enzyme is increased in response to the presence of its substrate?
Induction
Who proposed the operon model for the regulation of gene expression in E. coli?
Francois Jacob and Jacques Monod
What is the term for the enzymes that are present in negligible amounts in the absence of their substrate?
Inducible enzymes
Learn about the mechanisms of gene regulation, including negative control mechanisms, repressors, co-repressors, and activators. Understand how these molecules interact to control gene expression.
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