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Biochemistry
Biochemistry Multiple Choice
Quiz 1
Solution
Q.1.
Proto-oncogenes can be transformed to oncogenes by all of the following mechanisms except _____________
a) Elimination of their start signals for translation
b) During a viral infection cycle
c) Chromosomal rearrangements
d) Chemically induced mutagenesis
Q.2.
Oncogenes do not encode for ___________
a) Trans-membrane protein receptors
b) Growth factors
c) DNA-dependent RNA polymerase
d) Cytoplasmic G-proteins and protein kinases
Q.3.
Programmed cell death is termed as ___________
a) Metastasis
b) Apoptosis
c) Proliferation
d) Mitotic termination
Q.4.
Which of the following could be coded by a tumor-supressor gene?
a) A protein that helps prevent progression through cell cycle
b) A protein that helps prevent apoptosis
c) A protein that codes for a DNA repair enzyme
d) A protein that forms part of a growth factor signaling pathway
Q.5.
How does Ras oncogene contribute to cancers?
a) It codes for an anti-apoptotic protein, produced in abnormally large amounts
b) It codes for a GTPase switch protein, which in its mutated form cannot be switched off
c) It codes for a transcription factor produced abnormally in large amounts
d) A growth factor that is continually active is encoded in its truncated form
Q.6.
Which property of penables it to prevent the development of cancer?
a) It is a transcription factor that causes protein production which stimulates the cell cycle
b) It prevents replication of cells with damaged DNA
c) It prevents cells from triggering apoptosis
d) It stimulates synthesis of DNA repair enzymes that replace telomere sequence lost during cell division
Q.7.
The characteristic of malignant other than a benign tumor is?
a) Undergoes metastasis
b) Develops blood supply
c) Cell divides an unlimited number of times
d) Grows without needing a growth signal
Q.8.
The mutation which cannot give rise to an oncogene?
a) Addition or deletion of a base producing a nonsense message and an inactive protein product
b) A point mutation changing just one amino acid in protein product
c) A translocation, putting gene under control of strong promoter producing over expression
d) A point mutation producing stop codon, premature termination
Q.9.
Which of the following about Rb tumor suppressor protein is correct?
a) It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received
b) It is activated when phosphorylated by Cdk
c) It is a transcription factor
d) When a mitogenic signal is received, it binds the transcription factor E2F and thus stimulates the cell to enter S phase
Q.10.
Migration of cancerous cells from the site of origin to other part of the body forming secondary tumors is called ___________
a) Diapedesis
b) Metastasis
c) Proliferation
d) Apoptosis
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