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CELL SIGNALING MCQs

Total Questions : 22 | Page 2 of 3 pages
Question 11. Which of the following converts cAMP to AMP?
  1.    phosphodiesterase
  2.    protein phosphatase
  3.    GTPase
  4.    None of these
 Discuss Question
Answer: Option A. -> phosphodiesterase
Question 12. What is a phosphorylation cascade?
  1.    travelling of hormones through the air
  2.    travelling of hormones through the blood
  3.    the removal of a phosphate
  4.    a series of molecules that get phosphorylated
 Discuss Question
Answer: Option D. -> a series of molecules that get phosphorylated
Question 13. What does a protein phosphatase do?
  1.    removes phosphates
  2.    transfers phosphates from ATP to proteins
  3.    activates an enzyme with a signal molecule
  4.    All of above
 Discuss Question
Answer: Option A. -> removes phosphates
Question 14. Give the correct sequence of apoptosis:Nucleus begins to breakNucleus condensation and formation of blebPhagocytosis of apoptotic bodies
  1.    1,2,3
  2.    2,3,1
  3.    3,2,1
  4.    2,1,3
 Discuss Question
Answer: Option D. -> 2,1,3
Question 15. Each of the following numbered processes are involved in signal transduction pathways:i Responseii Amplificationiii Receptioniv TransductionWhich of the following represents the sequence of events in a typical signal transduction pathway?
  1.    i, ii, iii, iv
  2.    iii, i, iv, ii
  3.    ii, iv, i, iii
  4.    iii, iv, ii, i
 Discuss Question
Answer: Option D. -> iii, iv, ii, i
Question 16. A signal molecule that binds to a plasma membrane proteis is a
  1.    ligand
  2.    second messenger
  3.    protein kinase
  4.    receptor protein
 Discuss Question
Answer: Option A. -> ligand
Question 17. What is the amplification of a series of kinases called?
  1.    phosphorylation cascade
  2.    kinase cascade
  3.    phosphatase cascade
  4.    ATPase cascade
 Discuss Question
Answer: Option A. -> phosphorylation cascade
Question 18. All of the following statements about ligand-receptor complexes are true EXCEPT
  1.    Most receptors exhibit ligand specificity
  2.    Ligand–receptor interactions are reversible
  3.    Ligand–receptor interactions are reversible
  4.    Ligand-receptor complexes are most often formed in cell communication pathways in which participating cells are in direct contact
 Discuss Question
Answer: Option D. -> Ligand-receptor complexes are most often formed in cell communication pathways in which participating cells are in direct contact
Question 19. Signal amplification is most often achieved by
  1.    an enzyme cascade
  2.    binding of multiple signals
  3.    branching pathways
  4.    action of adenylyl cyclase
 Discuss Question
Answer: Option A. -> an enzyme cascade
Question 20. Which of the following is a chemical message that usually travels through the bloodstream to target cells?
  1.    hormone
  2.    local regulator
  3.    endocrine cell
  4.    None of these
 Discuss Question
Answer: Option A. -> hormone

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