Question 1

All of the following events play a role in yeast-mating type switching except

Accepted Answer

A)  methylation of the silent-mating-type locus.
B)  transcription of the gene at the MAT locus.
C)  chromatin condensation at the silent mating type locus.
D)  a recombination event known as gene conversion.E) None of the above
F) A) and C)

Question 2

Epigenetics marks refer to modifications to DNA and proteins that in turn regulate gene expression.Which statement is true regarding these specific types of modifications?

Accepted Answer

A)  They have the ability to both silence and activate genes.
B)  They can involve the methylation of cytosine bases.
C)  They are linked to the acetylation of histones.
D)  All of the aboveE) B) and C)
F) All of the above

Question 3

Which of the following statement(s) regarding transcription initiation and RNA Pol III is (are) true?

Accepted Answer

A)  ATP hydrolysis is not required for initiation.
B)  Pol III is responsible for synthesizing tRNAs and 5S-rRNA.
C)  The promoter elements of tRNA genes lie entirely within the transcribed sequence.
D)  all of the aboveE) A) and D)
F) None of the above D

Question 4

How does binding of the lac repressor to the lac operator block transcription initiation?

Accepted Answer

A)  lac repressor binding blocks RNA polymerase from interacting with DNA at the start site.
B)  lac repressor binding induces a DNase that cleaves the DNA at the transcription start site.
C)  lac repressor binding causes a conformational change in RNA polymerase.
D)  lac repressor binding induces a protease that degrades the sigma subunit of RNA polymerase.E) B) and D)
F) A) and B)

Question 5

Which of the following is not used in the electrophoretic mobility shift assay (EMSA) ?

Accepted Answer

A)  a radiolabeled DNA fragment
B)  a polyacrylamide gel
C)  a DNA binding protein
D)  DNase IE) B) and D)
F) None of the above

Question 6

Which of the following is NOT true regarding the chromatin-remodeling SWI/SNF complex?

Accepted Answer

A)  It acts as tumor suppressor.
B)  It serves as a co-activator of transcription.
C)  It has homology to DNA helicases.
D)  It can stabilize DNA-histone interactions.E) B) and C)
F) B) and D)

Question 7

Describe the role of histone deacetylation and hyperacetylation in yeast transcriptional control.

Accepted Answer

Histone deacetylation/hyperacetylation i...

Question 8

This serves as the promoter for 70% of eukaryotic genes and typically serves as a control region for genes that are transcribed at relatively low rates.

Accepted Answer

A)  TATA box
B)  enhancers
C)  CpG islands
D)  UAS (upstream activating sequences) E) A) and B)
F) A) and C)

Question 9

Which one of the following techniques would be best suited to follow how a thyroxine-bound receptor translocates from the cytoplasm to its DNA response element?

Accepted Answer

A)  in situ hybridization and a radioactive fragment of the DNA response element
B)  fluorescence microscopy and a GFP-tagged receptor fusion protein
C)  pulse-chase radiolabeling
D)  none of the aboveE) A) and B)
F) A) and C)

Question 10

Which one of the following terms is used to describe the protein:DNA complex containing several transcription factors bound to a single enhancer?

Accepted Answer

A)  nucleosome
B)  chromosome
C)  enhanceosome
D)  proteasomeE) B) and C)
F) C) and D)

Question 11

The human genome encodes transcription factors that contain an acidic activation domain that is phosphorylated in response to increased levels of the second messenger cAMP.Which one of the following contains one of these activation domains?

Accepted Answer

A)  CBP
B)  CDK9
C)  CREB
D)  CTDE) A) and B)
F) None of the above

Question 12

Which of the following is a fundamental difference between gene regulation in bacteria compared with eukaryotes?

Accepted Answer

A)  In bacteria,but not eukaryotes,there is a specific sequence that specifies where RNA polymerase binds and initiates transcription.
B)  In eukaryotes,but not bacteria,transcription can be influenced by how effectively the DNA sequence of a promoter region interacts with histone octamers.
C)  Transcription regulation is the most widespread form of control of gene expression in bacteria but not in eukaryotes.
D)  Gene regulation is readily reversible in eukaryotes but not bacteria.E) B) and C)
F) B) and D)

Question 13

Which protein domains are found in nuclear-receptor family members?

Accepted Answer

A)  variable region,DNA-binding domain,ligand-binding domain
B)  acetylase domain,DNA-binding domain,ligand-binding domain
C)  variable region,acetylase domain,ligand-binding domain
D)  variable region,DNA-binding domain,acetylase domainE) All of the above
F) C) and D)

Question 14

Enhancers are considered transcription-control elements that regulate the expression of eukaryotic genes.Which one of the following is true regarding these elements?

Accepted Answer

A)  They are only found upstream of the transcription start site.
B)  They are never found more than one kilobase away of the transcription start site.
C)  They are only found in introns.
D)  They generally range in length from about 50-200 base pairs.E) A) and C)
F) A) and D)

Question 15

A leucine-zipper motif contains

Accepted Answer

A)  a stretch of five leucine residues in a row.
B)  a leucine residue at every seventh position.
C)  a leucine residue complexed with a zinc ion.
D)  an alternating leucine-alanine-proline structure.E) B) and D)
F) A) and D)

Question 16

Describe how the electrophoretic mobility shift assay (EMSA)and the DNase I footprinting techniques are used to identify DNA-protein interactions.

Accepted Answer

In the electrophoretic mobility shift as...

Question 17

Operator constitutive mutants of the lac operon would

Accepted Answer

A)  express the lac repressor constitutively.
B)  block the binding of RNA polymerase to the promoter.
C)  express β-galactosidase constitutively.
D)  prevent the inducer from binding to the repressor.E) All of the above
F) None of the above C

Question 18

In bacteria,an operon:

Accepted Answer

A)  is a region of DNA that is transcribed as a single mRNA encoding several proteins.
B)  encodes for miRNAs.
C)  contains a promoter unique for each individual gene in the operator.
D)  none of the aboveE) All of the above
F) None of the above

Question 19

Regulation of transcription by steroid hormones

Accepted Answer

A)  involves hormone receptors only found in the nucleus.
B)  involves cytoplasmic hormone receptors that can move to the nucleus.
C)  involves two ligase domains.
D)  always activates transcription.E) A) and D)
F) None of the above B

Question 20

All the following statements about heterochromatin are true except:

Accepted Answer

A)  DNA dyes stain heterochromatin more darkly than euchromatin.
B)  The DNA of heterochromatin is more highly condensed than that of euchromatin.
C)  Heterochromatin is associated with inactive genes.
D)  Heterochromatin is more susceptible to DNaseI than is euchromatin.E) A) and D)
F) C) and D)

Exam 8: Transcriptional Control of Gene Expression

All of the following events play a role in yeast-mating type switching except

Correct AnswerverifiedShow Answer

Epigenetics marks refer to modifications to DNA and proteins that in turn regulate gene expression.Which statement is true regarding these specific types of modifications?

Correct AnswerverifiedShow Answer

Which of the following statement(s) regarding transcription initiation and RNA Pol III is (are) true?

Correct AnswerverifiedD

How does binding of the lac repressor to the lac operator block transcription initiation?

Correct AnswerverifiedShow Answer

Which of the following is not used in the electrophoretic mobility shift assay (EMSA) ?

Correct AnswerverifiedShow Answer

Which of the following is NOT true regarding the chromatin-remodeling SWI/SNF complex?

Correct AnswerverifiedShow Answer

Describe the role of histone deacetylation and hyperacetylation in yeast transcriptional control.

Correct AnswerverifiedHistone deacetylation/hyperacetylation i...View AnswerShow Answer

This serves as the promoter for 70% of eukaryotic genes and typically serves as a control region for genes that are transcribed at relatively low rates.

Correct AnswerverifiedShow Answer

Which one of the following techniques would be best suited to follow how a thyroxine-bound receptor translocates from the cytoplasm to its DNA response element?

Correct AnswerverifiedShow Answer

Which one of the following terms is used to describe the protein:DNA complex containing several transcription factors bound to a single enhancer?

Correct AnswerverifiedShow Answer

The human genome encodes transcription factors that contain an acidic activation domain that is phosphorylated in response to increased levels of the second messenger cAMP.Which one of the following contains one of these activation domains?

Correct AnswerverifiedShow Answer

Which of the following is a fundamental difference between gene regulation in bacteria compared with eukaryotes?

Correct AnswerverifiedShow Answer

Which protein domains are found in nuclear-receptor family members?

Correct AnswerverifiedShow Answer

Enhancers are considered transcription-control elements that regulate the expression of eukaryotic genes.Which one of the following is true regarding these elements?

Correct AnswerverifiedShow Answer

A leucine-zipper motif contains

Correct AnswerverifiedShow Answer

Describe how the electrophoretic mobility shift assay (EMSA)and the DNase I footprinting techniques are used to identify DNA-protein interactions.

Correct AnswerverifiedIn the electrophoretic mobility shift as...View AnswerShow Answer

Operator constitutive mutants of the lac operon would

Correct AnswerverifiedC

In bacteria,an operon:

Correct AnswerverifiedShow Answer

Regulation of transcription by steroid hormones

Correct AnswerverifiedB

All the following statements about heterochromatin are true except:

Correct AnswerverifiedShow Answer

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D

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Histone deacetylation/hyperacetylation i...
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In the electrophoretic mobility shift as...
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C

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B

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