Genetics: Inducible and Repressible Systems

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What is the main function of an operon in bacteria?

Code for transport proteins

Code for structural genes

Code for enzymes in a related metabolic pathway (correct)

Code for regulatory proteins

Where is the operator located in relation to the promoter and structural genes in an operon?

Upstream of the promoter

At the end of the operon

Between the promoter and structural gene (correct)

Downstream of the promoter

What binds to the operator to inhibit transcription of structural genes in an operon?

RNA polymerase

mRNA

Active repressor protein (correct)

Ribosomes

Which of the following is NOT an advantage of the operon model?

Individual gene regulation Signup and view all the answers

Where are regulatory genes, which code for regulatory proteins, typically located in relation to an operon?

Upstream of the operon Signup and view all the answers

Which type of operon system allows transcription to occur only when an inducer is present?

Inducible system Signup and view all the answers

What is the main characteristic of an inducible operon?

It requires an inducer to activate transcription Signup and view all the answers

Which of the following represents a distinguishing feature of the Trp operon?

The repressor binds to a co-repressor Signup and view all the answers

In a repressible operon, what happens when the co-repressor binds to the repressor?

The repressor becomes inactive Signup and view all the answers

Which type of metabolic pathway is associated with an inducible operon?

Catabolic pathway Signup and view all the answers

What role does the inducer play in an inducible operon?

It inactivates the repressor by changing its conformation Signup and view all the answers

What happens when the repressor cannot bind to the operator in a repressible system?

Transcription is activated Signup and view all the answers

What is the function of an inducer in a bacterial operon system?

Inactivates the repressor protein Signup and view all the answers

Which type of gene is responsible for encoding products required in basic cellular processes and is expressed all the time?

Constitutive gene Signup and view all the answers

In a repressible system, what role does a corepressor play?

Inactivates the repressor protein Signup and view all the answers

What is the function of polycistronic mRNA in gene expression?

Encodes multiple proteins in the same pathway Signup and view all the answers

What does an operator site on DNA do in relation to gene expression?

Prevents transcription initiation at adjacent promoters Signup and view all the answers

Which type of gene codes for proteins involved in regulating the expression of other genes?

Regulatory gene Signup and view all the answers