Biosignalling MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Biosignalling, a fundamental topic in the field of Biochemistry. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Biosignalling MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Biosignalling mcq questions that explore various aspects of Biosignalling problems. Each MCQ is crafted to challenge your understanding of Biosignalling principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Biochemistry tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Biosignalling MCQs are your pathway to success in mastering this essential Biochemistry topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Biosignalling. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Biosignalling knowledge to the test? Let's get started with our carefully curated MCQs!

Biosignalling MCQs | Page 3 of 11

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Q21.
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

Discuss
Answer: (a).Elimination of their start signals for translation
Q22.
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

Discuss
Answer: (c).DNA-dependent RNA polymerase
Q23.
Programmed cell death is termed as ___________

a.

Metastasis

b.

Apoptosis

c.

Proliferation

d.

Mitotic termination

Discuss
Answer: (b).Apoptosis
Q24.
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

Discuss
Answer: (a).A protein that helps prevent progression through cell cycle
Q25.
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

Discuss
Answer: (b).It codes for a GTPase switch protein, which in its mutated form cannot be switched off
Q26.
Which property of p53 enables 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

Discuss
Answer: (b).It prevents replication of cells with damaged DNA
Q27.
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

Discuss
Answer: (a).Undergoes metastasis
Q28.
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

Discuss
Answer: (a).Addition or deletion of a base producing a nonsense message and an inactive protein product
Q29.
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

Discuss
Answer: (a).It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received
Q30.
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

Discuss
Answer: (b).Metastasis
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