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 4 of 11

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Q31.
Which of the following statements is false about a ligand-gated ion channel receptor?

a.

They are present in the cell membrane

b.

They consist of five glycoproteins

c.

Differences in membrane potential affect whether the channel receptors are open or close

d.

Neurotransmitters can act as the chemical messengers for these channels

Discuss
Answer: (c).Differences in membrane potential affect whether the channel receptors are open or close
Q32.
Voltage regulation means ____________

a.

Na⁺/K⁺ pumps controls potential

b.

Unless the voltage is regular gates will not respond

c.

Oscilloscope only can control potential

d.

With changes in the membrane potential voltage gated ion channels open and close

Discuss
Answer: (d).With changes in the membrane potential voltage gated ion channels open and close
Q33.
Depolarization and repolarization changes that occur during the action potential are produced by ____________

a.

Negative feedback loops

b.

Carrier mediated transport

c.

Simple diffusion of ions down their concentration gradient

d.

Active transport pumps along the neuron membrane

Discuss
Answer: (d).Active transport pumps along the neuron membrane
Q34.
Diffusion of K⁺ out of the cell makes the inside of it less positive, or more negative and acts to restore the original resting membrane potential. This process is called ____________

a.

Repolarization

b.

Depolarization

c.

Hyperpolarization

d.

Overshoot

Discuss
Answer: (a).Repolarization
Q35.
Which of the following statements about action potential is false?

a.

Na⁺/K⁺ pumps are directly involved in creating the action potential

b.

Na⁺ and K⁺ concentrations are not significantly changed during an action potential

c.

This includes both positive and negative feedback loops

d.

Only a relatively small number of Na⁺ and K⁺ actually diffuse across the membrane

Discuss
Answer: (b).Na⁺ and K⁺ concentrations are not significantly changed during an action potential
Q36.
At the end of each phase of cell cycle cyclins activating Cdks in that phase are inactivated irreversibly by _____________

a.

Multiple phosphorylations

b.

De-phosphorylation

c.

Ubiquitinylation

d.

Destabilizing by proteolysis in a proteosome

Discuss
Answer: (d).Destabilizing by proteolysis in a proteosome
Q37.
At which cell cycle checkpoint, cell cycle is halted if cell’s DNA is damaged?

a.

G₁ – S

b.

S – G₂

c.

G₂ – M

d.

G₀ – G₁

Discuss
Answer: (a).G₁ – S
Q38.
Which of the following occurs in meiosis but not in mitosis?

a.

Attachment of spindle fibers to kinetochore

b.

Replication of DNA prior to start of cell division

c.

Separation of sister chromatids at anaphase

d.

Pairing of homologous chromosomes at metaphase plate

Discuss
Answer: (d).Pairing of homologous chromosomes at metaphase plate
Q39.
Passage of a cell through stages of cell cycle is controlled by a protein kinase that phosphorylates many different proteins at appropriate times.

a.

Cdk activating kinase

b.

Cyclin-dependent kinase

c.

Cyclins

d.

Tyrosine kinase

Discuss
Answer: (b).Cyclin-dependent kinase
Q40.
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
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