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 2 of 11

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Q11.
Which of the following statements regarding cyclin-dependent protein kinase is not correct?

a.

Their activity is regulated by cyclins

b.

They can alter the activity of proteins involve in the progression of cells through cell cycle

c.

Their activity fluctuates during cell cycle

d.

Each type of cell contains one specific form

Discuss
Answer: (c).Their activity fluctuates during cell cycle
Q12.
Which of the following statements regarding cyclins is not correct?

a.

They can become linked to ubiquitin

b.

They catalyze the phosphorylation of protein

c.

They contain a specific amino acid sequence that target them for proteolysis

d.

They are activated and degraded during cell cycle

Discuss
Answer: (d).They are activated and degraded during cell cycle
Q13.
What is Ubiquitin?

a.

Protein kinase

b.

Protease

c.

Component of the electron transport system

d.

Protein that tags another protein for proteolysis

Discuss
Answer: (d).Protein that tags another protein for proteolysis
Q14.
Cdk2/cyclinE functions in ____________

a.

G₂/M transition

b.

G₂

c.

M

d.

G₁/S transition

Discuss
Answer: (d).G₁/S transition
Q15.
In which phase of cell cycle is DNA replicated?

a.

G₁ phase

b.

S phase

c.

G₂ phase

d.

M phase

Discuss
Answer: (b).S phase
Q16.
Cyclin dependent kinases which control progression through cell cycle checkpoints are totally activated by which of the following?

a.

Binding to cyclin, plus phosphorylation by a Cdk activating protein kinase

b.

Binding to cyclins

c.

Phosphorylation by Cdk activating protein kinase

d.

Phosphorylation by a tyrosine kinase

Discuss
Answer: (a).Binding to cyclin, plus phosphorylation by a Cdk activating protein kinase
Q17.
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
Q18.
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
Q19.
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
Q20.
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
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