Questions and answers for exam Preparation

MCQs

Total Questions : 101 | Page 6 of 11 pages

Question 51. What is Ubiquitin?

Protein kinase
Protease
Component of the electron transport system
Protein that tags another protein for proteolysis

Discuss Question

Answer: Option D. -> Protein that tags another protein for proteolysis
Answer: (d).Protein that tags another protein for proteolysis

Question 52. Which property of p53 enables it to prevent the development of cancer?

It is a transcription factor that causes protein production which stimulates the cell cycle
It prevents replication of cells with damaged DNA
It prevents cells from triggering apoptosis
It stimulates synthesis of DNA repair enzymes that replace telomere sequence lost during cell division

Discuss Question

Answer: Option B. -> It prevents replication of cells with damaged DNA
Answer: (b).It prevents replication of cells with damaged DNA

Question 53. The characteristic of malignant other than a benign tumor is?

Undergoes metastasis
Develops blood supply
Cell divides an unlimited number of times
Grows without needing a growth signal

Discuss Question

Answer: Option A. -> Undergoes metastasis
Answer: (a).Undergoes metastasis

Question 54. Migration of cancerous cells from the site of origin to other part of the body forming secondary tumors is called ___________

Diapedesis
Metastasis
Proliferation
Apoptosis

Discuss Question

Answer: Option B. -> Metastasis
Answer: (b).Metastasis

Question 55. Which of the following about Rb tumor suppressor protein is correct?

It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received
It is activated when phosphorylated by Cdk
It is a transcription factor
When a mitogenic signal is received, it binds the transcription factor E2F and thus stimulates the cell to enter S phase

Discuss Question

Answer: Option A. -> It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received
Answer: (a).It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received

Question 56. The mutation which cannot give rise to an oncogene?

Addition or deletion of a base producing a nonsense message and an inactive protein product
A point mutation changing just one amino acid in protein product
A translocation, putting gene under control of strong promoter producing over expression
A point mutation producing stop codon, premature termination

Discuss Question

Answer: Option A. -> Addition or deletion of a base producing a nonsense message and an inactive protein product
Answer: (a).Addition or deletion of a base producing a nonsense message and an inactive protein product

Question 57. The information which is represented by a signal is detected by specific receptors and converted to a cellular response; this conversion is called _____________