Cell Bio - Chapter 13 (Book Questions)

23 Questions | By Angelsheffield | Updated: Mar 20, 2022 | Attempts: 243

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Cell Bio - Chapter 13 (Book Questions) - Quiz

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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?
16.

What is the structure labeled B?
17.

What is the structure labeled C?
18.

What is the structure labeled D?
19.

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.