Gene Regulation and Expression Control

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What is the role of a repressor protein in gene regulation?

It binds to the inducer and reduces its activity

It binds to the RNA polymerase and enhances its activity

It binds to the promoter and increases transcription

It binds to the operator and prevents transcription (correct)

What type of pathways are usually characterized by the presence of a gene product inhibiting gene expression?

Constitutive pathways

Repressible pathways (correct)

Inducible pathways

Regulatory pathways

What is the function of an activator protein in gene regulation?

It reduces the activity of an inducer molecule

It inhibits the binding of RNA polymerase to the promoter

It enhances the binding of RNA polymerase to the promoter (correct)

It represses the transcription of a gene

What is the role of the end product tryptophan in the anabolic pathway that leads to its synthesis?

It inhibits the gene expression Signup and view all the answers

What is the term used to describe genes that are switched on in response to an external stimulus?

Inducible genes Signup and view all the answers

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 Signup and view all the answers

What is the role of an inducer molecule in gene regulation?

It binds to the repressor protein and inhibits its activity Signup and view all the answers

What is the term used to describe the mechanism by which genes are turned off in response to an external stimulus?

Negative control mechanism Signup and view all the answers

In negative regulation, what is the default state of RNA production?

It is active Signup and view all the answers

What is the term used to describe the process of switching on and off gene expression in response to environmental changes?

Gene regulation Signup and view all the answers

What is the term for the regulator molecule that directly stimulates RNA production in positive regulation?

Activator Signup and view all the answers

What is the purpose of the inhibitor in gene regulation?

To prevent the activator from binding to DNA Signup and view all the answers

What is the role of a small effector molecule in genetic regulatory proteins?

It brings about conformational changes in the regulatory protein Signup and view all the answers

What type of enzymes are produced in response to the presence of lactose in E. coli?

Inducible enzymes Signup and view all the answers

What is the role of regulatory proteins in gene expression?

To activate or block transcription Signup and view all the answers

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 Signup and view all the answers

Who proposed the operon model for the regulation of gene expression in E. coli?

Francois Jacob and Jacques Monod Signup and view all the answers

What is the term for the enzymes that are present in negligible amounts in the absence of their substrate?