Cell Signalling and Transduction MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Cell Signalling and Transduction, 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 Cell Signalling and Transduction 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 Cell Signalling and Transduction mcq questions that explore various aspects of Cell Signalling and Transduction problems. Each MCQ is crafted to challenge your understanding of Cell Signalling and Transduction 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 Cell Signalling and Transduction 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 Cell Signalling and Transduction. 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 Cell Signalling and Transduction knowledge to the test? Let's get started with our carefully curated MCQs!

Cell Signalling and Transduction MCQs | Page 5 of 6

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Q41.
Small charged molecules, often biogenic amines function as

a.

hormones

b.

neurotransmitters

c.

both (a) and (b)

d.

none of these

Discuss
Answer: (c).both (a) and (b)
Q42.
SH2 domains specifically bind to

a.

phosphorylated serine residues

b.

phosphorylated tyrosine residues

c.

GDP

d.

Ca2+

Discuss
Answer: (b).phosphorylated tyrosine residues
Q43.
In paracrine signaling, the signaling molecules affects only

a.

target cells close to the cell from which it was secreted

b.

target cells distant from its site of synthesis in cells of an endocrine organ

c.

both (a) and (b)

d.

none of the above

Discuss
Answer: (a).target cells close to the cell from which it was secreted
Q44.
Simple nerve reflexes use signaling molecules called

a.

neurotransmitters

b.

nitric oxides

c.

G proteins

d.

proteases

Discuss
Answer: (a).neurotransmitters
Q45.
Which of the following is not a type of signaling molecule?

a.

Testosterone

b.

Insulin

c.

Thyroxin

d.

Adenylate cyclase

Discuss
Answer: (d).Adenylate cyclase
Q46.
Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it

a.

changes the shape and thus the enzymatic activity of the proteins involved

b.

makes the receptor more likely to capture the signaling, molecule

c.

allows hydrophilic signaling molecules to cross the plasma membrane

d.

None of the above

Discuss
Answer: (a).changes the shape and thus the enzymatic activity of the proteins involved
Q47.
Which of the following statements about G proteins is false?

a.

They are involved in signal cascades

b.

They bind to and are regulated by guanine nucleotides

c.

They become activated when bound to GDP

d.

They must be active before the cell can make needed cAMP

Discuss
Answer: (c).They become activated when bound to GDP
Q48.
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

a.

signaling molecule; receptor; G proteins

b.

signaling molecule; target cell; G proteins

c.

signaling molecule; target cell; receptors

d.

kinase; receptor; proteases

Discuss
Answer: (c).signaling molecule; target cell; receptors
Q49.
Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?

a.

Because other body tissues use a different signaling molecule

b.

Because nitric oxide cannot cross cell membranes and enter the blood

c.

Because nitric oxide breaks down quickly and thus cannot travel far

d.

None of the above

Discuss
Answer: (c).Because nitric oxide breaks down quickly and thus cannot travel far
Q50.
Which of the following comes under the category of cell surface receptor?

a.

Enzyme linked receptors

b.

Ion-channel linked receptors

c.

G protein linked receptors

d.

All of these

Discuss
Answer: (d).All of these
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