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

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

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 protein that binds to the operator to prevent transcription.

What does the operator segment of DNA do?

It controls the transcription of structural genes.

It initiates 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.

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

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 protein that binds to the DNA to regulate gene expression.

What is the role of the promoter in the operon model of gene expression?

It is where transcription begins

What is the function of the operator in the operon model of gene expression?

It is where transcription begins

What happens in the absence of lactose regarding the operon model of gene expression?

The repressor binds to the operator, preventing transcription.

The repressor binds to the operator, allowing transcription.

The repressor does not bind to anything, and transcription occurs.

A metabolite of lactose binds to the repressor, allowing transcription.

What is the role of allolactose in the operon model of gene expression?

It binds to the repressor, preventing it from binding to the operator and allowing transcription.

It binds to the operator, allowing transcription.

It binds to the operator, preventing transcription.

It has no role in the operon model of gene expression.

What does an operon consist of?

Promoter (P) and operator (O) sites and structural genes

Only structural genes that code for the protein

What is the role of the regulatory gene in the operon model?

It codes for the repressor protein that binds to the operator.

It provides the energy necessary for transcription.

It acts as a structural gene coding for the protein.

It serves as the attachment site for RNA polymerase.

What happens when the repressor is active in an inducible operon?

The repressor protein binds with the operator, preventing transcription from the operon.

Transcription of the operon is initiated.

What happens when the inducer allolactose binds to the repressor protein in an inducible operon?

The repressor protein is inactivated, allowing transcription to occur.

The repressor protein remains active and continues to block transcription.

The structural genes are immediately translated without transcription.

The operon is permanently turned off and cannot be reactivated.

What are the structural genes in the inducible operon responsible for when transcribed?

The production of enzymes for lactose catabolism.

The activation of the repressor protein.

The replication of the operon DNA.

What does catabolite repression inhibit in cells?

Cells from using carbon sources other than glucose

The production of cyclic AMP (cAMP)

What does cAMP bind to in order to initiate transcription and allow the cell to use lactose?

The catabolic activator protein (CAP)

According to Figure 8.14, how do bacteria growing on glucose as the sole carbon source compare to those growing on lactose in terms of growth rate?

Bacteria grow faster on glucose than on lactose.

Bacteria grow faster on lactose than on glucose.

Bacteria grow at the same rate on glucose and lactose.

There is no difference in growth; bacteria do not grow on glucose or lactose.

What happens after E. coli consumes all the glucose in a medium containing both glucose and lactose, as shown in Figure 8.14?

The bacteria experience a short lag time before starting to consume lactose.

The bacteria immediately start consuming lactose with no lag time.

The bacteria die off as they cannot consume lactose.

The bacteria continue to grow at the same rate without consuming lactose.

During the lag time shown in Figure 8.14, when E. coli switches from consuming glucose to lactose, what intracellular change occurs?

Intracellular cAMP levels increase.

Intracellular cAMP levels decrease.

Intracellular cAMP levels remain constant.

Intracellular cAMP levels are not related to the consumption of lactose.

What happens to the lac operon when lactose is present and glucose is scarce?

The lac operon produces large amounts of mRNA for lactose digestion because CAP is activated.

The lac operon is not transcribed because CAP is inactive.

The lac operon is not transcribed because the lac repressor is active.

The lac operon is transcribed at a low level because cAMP levels are low.

What is the role of cAMP in the regulation of the lac operon when glucose levels are low?

cAMP binds to inactive CAP, converting it to its active form.

cAMP activates the lac repressor, preventing transcription.

cAMP directly binds to RNA polymerase to initiate transcription.

cAMP deactivates CAP, preventing transcription.

What occurs to the lac operon when both lactose and glucose are present?

CAP remains inactive and cannot stimulate transcription.

CAP is activated, leading to high levels of transcription.

The lac repressor is inactivated, allowing RNA polymerase to bind and transcribe.

The lac repressor is activated, and transcription is increased.

What role does tryptophan play in the regulation of repressible operons?

It serves as a corepressor that activates the repressor.

It acts as an inducer that initiates transcription.

It functions as a promoter that enhances gene expression.

It operates as an enzyme that digests proteins.

What components does an operon consist of according to Figure 8.13?

Promoter, operator, and structural genes

Promoter, enhancer, and silencer

Operator, repressor, and activator

Regulatory gene, promoter, and terminator

What regulates the operon as shown in Figure 8.13?

The product of the regulatory gene (I)

The product of the structural genes

The product of the promoter (P)

The product of the operator (O)

What happens when the repressor is inactive in a repressible operon?

Transcription and translation proceed, leading to the synthesis of tryptophan.

Transcription and translation are halted.

The operon is removed from the DNA.

What is the role of RNA polymerase in the diagram?

It synthesizes mRNA from the operon.

It deactivates the repressor protein.

It breaks down the operon mRNA.

It synthesizes the polypeptides for tryptophan synthesis.

What are the polypeptides mentioned in the diagram used for?

They comprise the enzymes for tryptophan synthesis.

They make up the repressor protein.

They are involved in the replication of DNA.

What happens when the corepressor tryptophan binds to the repressor protein in a repressible operon?

The repressor protein is activated, and transcription is prevented.

The repressor protein is inactivated, and transcription is initiated.

The repressor protein is activated, and transcription is initiated.

The repressor protein is inactivated, and transcription is prevented.

Can methylated genes be inherited by offspring?

Yes, they can be passed to offspring

No, they cannot be passed to offspring

Only in certain rare conditions

Is the epigenetic change due to methylation permanent?

It is permanent only in animals

It is permanent only during embryonic development

B) A permanent change in the base sequence of DNA

A) A temporary change in the base sequence of RNA

C) A permanent change in the base sequence of RNA

D) A temporary change in the base sequence of DNA

Which of the following can be a characteristic of mutations?

D) They may be neutral, beneficial, or harmful

A) Agents that prevent mutations

C) Agents that repair mutations

When do spontaneous mutations occur?

A) In the presence of a mutagen

D) During RNA transcription only

What is the result of the base substitution if it is not corrected before the next round of replication?

An AT pair is formed in place of the original GC pair.

The original GC pair remains unchanged.

A CG pair is formed instead of the original GC pair.

A TA pair is formed in place of the original GC pair.

Bacterial Gene Expression Quiz

Authored by madison maria

Biology

University

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57 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Constitutive genes

Inducible genes

Repressible genes

None of the above

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the default position of a repressible gene?

Off

Variable

Non-functional

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What initiates the process of induction in gene expression?

Repressor

Inducer

Enzyme

Gene

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the default position of an inducible gene?

Off

Active

Repressed

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Bacterial Gene Expression Quiz

How are constitutive genes expressed in bacteria?

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

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

What is the role of repressors in gene expression?

What is the default position of a repressible gene?

What initiates the process of induction in gene expression?

What is the default position of an inducible gene?

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

What does the operator segment of DNA do?

What is an operon?

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