How are constitutive genes expressed in bacteria?

• At a variable rate depending on the environment

• Only in the presence of a substrate

• At a fixed rate

• In response to a repressor

Which type of genes in bacteria are expressed only as needed?

• Constitutive genes

• Inducible genes

• Repressible genes

• None of the above

What is the term used to describe the inhibition of gene expression due to the presence of a preferred energy source?

• Gene silencing

• Operon repression

• Catabolite repression

• Metabolic inhibition

What is the role of repressors in gene expression?

• They initiate gene expression

• They block transcription

• They have no effect on gene expression

• They enhance enzyme synthesis

What is the default position of a repressible gene?

• Off

• On

• Variable

• Non-functional

What initiates the process of induction in gene expression?

• Repressor

• Inducer

• Enzyme

• Gene

What is the default position of an inducible gene?

• On

• Off

• Active

• Repressed

What is the function of a promoter in the operon model of gene expression?

• It is a set of operator and promoter sites and the structural genes they control.

• It is a segment of DNA that controls the transcription of structural genes.

• It is a segment of DNA where RNA polymerase initiates transcription of structural genes.

• It is a protein that binds to the operator to prevent transcription.

What does the operator segment of DNA do?

• It initiates transcription of structural genes.

• It controls the transcription of structural genes.

• It is a set of operator and promoter sites and the structural genes they control.

• It is a protein that binds to the promoter to initiate transcription.

What is an operon?

• It is a segment of DNA where RNA polymerase initiates transcription of structural genes.

• It is a segment of DNA that controls the transcription of structural genes.

• It is a set of operator and promoter sites and the structural genes they control.

• It is a protein that binds to the DNA to regulate gene expression.