Cell Bio - Chapter 13 (Book Questions)
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- 1.Which of following illustrates negative control?
- A.
A repressor that becomes active when bound to a corepressor and inhibits transcription.
- B.
A gene that binds a repressor and becomes active.
- C.
An activator that becomes active when bound to a coactivator and activates transcription.
- D.
A repressor that binds a gene and becomes inactive.
- 2.In regulation of the lac operon, when lactose is present and glucose is absent
- A.
The repressor is able to bind to the operator.
- B.
The repressor is unable to bind to the operator.
- C.
Transcription of structural genes occurs.
- D.
Transcription of lactose occurs.
- E.
Both b and c are correct.
- 3.In regulation of the trp operon, when tryptophan is present,
- A.
The repressor is able to bind to the operator.
- B.
The repressor is unable to bind to the operator.
- C.
Transcription of the repressor is inhibited.
- D.
Transcription of the structural genes, operator, and promoter occurs.
- 4.In common operon models, the function of the promoter is to
- A.
Code for the repressor protein.
- B.
Bind with RNA polymerase.
- C.
Bind to the repressor.
- D.
Code for the regulator gene.
- 5.Which of the following statements is/are true regarding operons?
- A.
The regulator gene is transcribed with the structural genes.
- B.
The structural genes are always transcribed.
- C.
All genes are always transcribed.
- D.
The regulator gene has its own promoter.
- 6.Which of the following regulate gene expression in the eukaryotic nucleus?
- A.
Posttranslational control
- B.
Transcriptional control
- C.
Posttranscriptional control
- D.
Translational control
- E.
Both b and c are correct.
- 7.Which of the following mechanisms may create multiple mRNAs from the same gene?
- A.
Posttranslational control
- B.
Alternative mRNA splicing
- C.
Binding of a transcription factor
- D.
Chromatin remodeling
- E.
MiRNAs
- 8.Translational control of gene expression occurs within the
- A.
Nucleus
- B.
Cytoplasm
- C.
Nucleolus
- D.
Mitochondria
- 9.Alternative mRNA splicing is an example of which type of regulation of gene expression?
- A.
Transcriptional
- B.
Posttranscriptional
- C.
Translational
- D.
Posttranslational
- 10.A scientist adds radioactive uridine (label for RNA) to a culture of cells and examines an autoradiograph. Which type of chromatin is apt to show the label?
- A.
Heterochromatin
- B.
Euchromatin
- C.
The histones, not the DNA
- D.
The DNA, not the histones
- E.
Both a and D are correct
- 11.Barr bodies are
- A.
Genetically active X chromosomes in males.
- B.
Genetically inactive X chromosomes in females.
- C.
Genetically active Y chromosomes in males.
- D.
Genetically inactive Y chromosomes in females.
- 12.Which of these might cause a proto-oncogene to become an oncogene?
- A.
Exposure of the cell to radiation
- B.
Exposure of the cell to certain chemicals
- C.
Viral infection of the cell
- D.
Exposure of the cell to pollutants
- E.
All of these are correct
- 13.A cell is cancerous. You might find an abnormality in
- A.
A proto-oncogene.
- B.
A tumor suppressor gene.
- C.
Regulation of the cell cycle.
- D.
Tumor cells.
- E.
All of these are correct.
- 14.A tumor suppressor gene
- A.
Inhibits cell division
- B.
Opposes oncogenes
- C.
Prevents cancer
- D.
Is subject to mutations
- E.
All of these are correct
- 15.
![What is the structure labeled A? - ProProfs]( "What is the structure labeled A?")
What is the structure labeled A? - 16.
![What is the structure labeled B? - ProProfs]( "What is the structure labeled B?")
What is the structure labeled B? - 17.
![What is the structure labeled C? - ProProfs]( "What is the structure labeled C?")
What is the structure labeled C? - 18.
![What is the structure labeled D? - ProProfs]( "What is the structure labeled D?")
What is the structure labeled D? - 19.
![What is the structure labeled E? - ProProfs]( "What is the structure labeled E?")
What is the structure labeled E? - 20.If the DNA codons are CAT CAT CAT, and a guanine base is added at the beginning, which would result?
- A.
CAT CAT CAT G
- B.
G CAT CAT CAT
- C.
GCA TCA TCA T
- D.
GC ATC ATC AT
- 21.A mutation in a DNA molecule involving the replacement of one nucleotide base pair with another is called a(n)
- A.
Frameshift mutation.
- B.
Transposon.
- C.
Deletion mutation.
- D.
Point mutation.
- E.
Insertion mutation.
- 22.Which of these is characteristic of cancer?
- A.
It may involve a lack of mutations over a length of time.
- B.
It cannot be tied to particular environmental factors.
- C.
Apoptosis is one of the first developmental effects.
- D.
Mutations in certain types of genes.
- E.
It typically develops within a short period of time.
- 23.Which is not evidence that eukaryotes control transcription?
- A.
Euchromatin/heterochromatin
- B.
Existence of transcription factors
- C.
Lampbrush chromosomes
- D.
Occurrence of mutations
- E.
All of these are correct.
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