Chapter 16 Lecture

Multiple Choice

The regulation of an operon by Activator is referred to as

• negative regulation

• positive regulation

• both a and b

• neutral regulation

Multiple Choice

The regulation of an operon by repressor is referred to as

• negative regulation

• positive regulation

• both a and b

• neutral regulation

Multiple Choice

The regulation of an operon by repressor is referred to as

• negative regulation

• positive regulation

• both a and b

• neutral regulation

Multiple Choice

what is an operon?

• a part of a ribsome
• a part of a Rna
• a unit made up of linked genes that code for proteins needed to do a specific task
• needed for dna replication

Multiple Choice

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor

Multiple Choice

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene

Multiple Choice

What is the name of the stretch of DNA where RNA polymerase binds?

• operator
• promoter
• enhancer
• origin

Multiple Choice

What is the role of operons in prokaryote gene expression?

• It makes the genes prokaryotes be turned on
• It accounts for the regulation of gene activity in response to the needs of the cells
• To make DNA for the gene
• To make the gene turn of and off

Multiple Choice

The lac operon genes only become expressed if:

• lactose binds to the repressor
• glucose binds to the repressor
• lactose binds to the operator
• the repressor binds to the operator

Multiple Choice

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell
• glucose is present in the cell
• lactose is present in the cell

Multiple Choice

Operons are found in the cells of which of the following types of organisms?

• prokaryotes (bacteria)
• eukaryotes (plant and animals)
• animals only
• viruses

Multiple Choice

In the lac operon the inducer is

• allolactose

• glucose

• galactose

• all of the above

Multiple Choice

What is the inducer in the lac operon?

• cAMP

• glucose

• lactose

• CRP

Multiple Choice

Genes can be shut off (not expressed) when a ___ binds to the ____.

• activator, operator

• repressor, operator

• corepressor, operator

• repressor, promotor

Multiple Choice

What molecule can remove a repressor protein from the operator?

• a corepressor

• an inducer

Multiple Choice

Genes can be turned on (expressed) when a(n) ____ such as CRP or cAMP receptor protein binds to the CRP binding site.

• repressor

• corepressor

• inducer

• activator

Multiple Choice

When Glucose is high which molecule is prevented from binding to the Lac Operon therefor preventing the breakdown of Lactose?

• Beta-galactosidase
• cAMP receptor protein (CRP)
• Glucose transporter
• Lactose

Multiple Choice

In the lac operon system, __ must first bind to CRP so that it is capable of binding to the DNA. This occurs when glucose levels are __.

• cAMP, high

• cAMP, low

• inducer, high

• inducer, low

Multiple Choice

What type of operon is the trp (tryptophan) operon?

• inducible
• repressible
• positive control
• promoible

Multiple Choice

Which of the following statements regarding the trp operon is true?

• The operator region produces the mRNA that codes for the repressor.

• The regulatory gene is not transcribed in the presence of the repressor.

• Repressor proteins are inactivated by the presence of the repressor. .

• The trp operon is always activated unless deactivated by a repressor

Multiple Choice

Why is the transcription of structural genes of the trp operon turned off in the presence of tryptophan?

• Tryptophan is the repressor that binds to the operator, preventing transcription.

• The structural genes are used to make tryptophan, which would not be needed if tryptophan is available.

• Tryptophan has no effect on the transcription of the structural genes.

• Tryptophan RNA polymerase from finding the promoter of the trp operon, preventing structural gene transcription.

Multiple Choice

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene

Multiple Choice

In the top picture the operon is

• on

• off

Multiple Choice

In the trp operon, __ acts as a __ and helps the repressor bind to the operator.

• tryptophan, corepressor

• tryptophan, inducer

• lactose, corepressor

• lactose, inducer

Multiple Choice

In eukaryotes, proteins that help the RNA polymerase bind to the regulatory region for transcription are called ____________.

• transcription factors
• topoisomerase
• regulatory genes
• activators

Multiple Choice

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

• The two different cells become mutated
• The proteins expressed in each cell are different
• They actually have different DNA in the two types of cells.
• The genome of the different cells changes

Multiple Choice

Eukaryotes need to regulate their genes

• during cell specialization that occurs during development

• in order to maintain homeostasis

• both a and b

• neither a or b

Multiple Choice

Gene regulation is the process that is used to:

• help make sugars for cells in plants.

• make glycosomes in cells.

• turn genes on and off.

• Not sure, need help.

Multiple Choice

___ are DNA sequences which are often located far from the genes they regulate in eukaryotes where transcription activators can bind.

• histones

• promotors

• enhancers

Multiple Choice

Which of the following help to turn genes on so that they are expressed (transcribed and translated)?

• a high level of condensation (coiling around histones)

• histone acetylation

• DNA methylation

• histone methylation

Drag and Drop

miRNA and siRNA both control Gene expression by by targeting ____________ during the process of ___________


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Placeholder

Drag these tiles and drop them in the correct blank above

mRNA, Translation

mRNA, Transcription

DNA, Translation

DNA, Transcription

Multiple Choice

Alternative RNA splicing involves

• removing introns and splicing the same exons together

• removing exons and splicing the same introns together

• removing introns and splicing different exons together

• removing exons and splicing different introns together

Multiple Choice

What proteins bind to the mRNA in order to prevent the ribosome from attaching an therefor preventing translation?

• Enzyme activators
• Ribosomal proteins
• Translation inhibitors or repressor proteins
• mRNA stabilizers

Multiple Choice

What molecule marks a protein for degradation? Where does the protein go to be destroyed once it has been marked

• Phosphorylation; Endoplasmic reticulum
• Lysosome; Mitochondria
• Ubiquitin; Proteasome
• Acetylation; Golgi apparatus