Biochemistry Multiple Choice Online Exam Quiz
Biochemistry Multiple Choice GK Quiz. Question and Answers related to Biochemistry Multiple Choice. MCQ (Multiple Choice Questions with answers about Biochemistry Multiple Choice
Which of the following could be coded by a tumor-supressor gene?
Options
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
The mutation which cannot give rise to an oncogene?
Options
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
Migration of cancerous cells from the site of origin to other part of the body forming secondary tumors is called ___________
Options
A : Diapedesis
B : Metastasis
C : Proliferation
D : Apoptosis
Proto-oncogenes can be transformed to oncogenes by all of the following mechanisms except _____________
Options
A : Elimination of their start signals for translation
B : During a viral infection cycle
C : Chromosomal rearrangements
D : Chemically induced mutagenesis
Which of the following about Rb tumor suppressor protein is correct?
Options
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
How does Ras oncogene contribute to cancers?
Options
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
Which property of p53 enables it to prevent the development of cancer?
Options
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
Programmed cell death is termed as ___________
Options
A : Metastasis
B : Apoptosis
C : Proliferation
D : Mitotic termination
Oncogenes do not encode for ___________
Options
A : Trans-membrane protein receptors
B : Growth factors
C : DNA-dependent RNA polymerase
D : Cytoplasmic G-proteins and protein kinases
The characteristic of malignant other than a benign tumor is?
Options
A : Undergoes metastasis
B : Develops blood supply
C : Cell divides an unlimited number of times
D : Grows without needing a growth signal
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