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 5 of 11

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Q41.
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
Q42.
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
Q43.
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
Q44.
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
Q45.
Which out of the following is not a neurotransmitter?

a.

Noadrenaline

b.

Cyclic AMP

c.

Dopamine

d.

Acetyl choline

Discuss
Answer: (b).Cyclic AMP
Q46.
SH₂ domain specifically binds to _____________

a.

GDP

b.

Ca⁺²

c.

Phosphorylated tyrosine residues

d.

Phosphorylated serine residues

Discuss
Answer: (c).Phosphorylated tyrosine residues
Q47.
cAMP and cGMP are derived from ____________

a.

ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively

b.

ATP and GTP by the actions of adenylate cyclase and gualnlate cyclase respectively

c.

GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively

d.

None of the mentioned

Discuss
Answer: (b).ATP and GTP by the actions of adenylate cyclase and gualnlate cyclase respectively
Q48.
Which of the following is false about phosphorylation by IRS on serine residue?

a.

It is an inhibitory phosphorylation

b.

It is molecular mechanism for insulin resistance

c.

It increases insulin levels

d.

Target tissues fail to respond to circulating insulin

Discuss
Answer: (c).It increases insulin levels
Q49.
The enzyme activated by cyclic AMP, passing on the hormonal signal is ____________

a.

Protein kinase B

b.

Protein kinase A

c.

Protein kinase C

d.

G protein receptor kinase

Discuss
Answer: (b).Protein kinase A
Q50.
Protein kinase ERK is activated by phosphorylation of ____________

a.

Only Thr

b.

Only Tyr

c.

Both Thr and Tyr

d.

Only Ser

Discuss
Answer: (c).Both Thr and Tyr
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