Quiz  /  Cell Signaling Class 12 MCQ Questions With Answers

  • 1. 
    The three stages of cell signalling are

  • paracrine, local, and synaptic
  • reception, transduction, and response
  • transcription, translation, and folding
  • alpha, beta, and gamma

  • 2. 
    The source of phosphate for a phosphorylation cascade is __________.

  • cAMP
  • protein kinase
  • GTP
  • ATP
  • protein phosphatase

  • 3. 
    G proteins are a family of proteins involved in transmitting chemical signals originating from outside a cell into the inside of the cell. G proteins function as molecular switches.Which of the following best describes the role in which the G protein is most intimately involved in the process shown above?

  • Production of the ligand molecule.
  • Reception of the signal.
  • Transduction of the signal.
  • Production of response to signal.

  • 4. 
    A signal molecule that binds to a plasma-membrane protein is a

  • ligand
  • second messenger
  • protein kinase
  • receptor protein

  • 5. 
    1. Each of the following numbered processes are involved in signal transduction pathways: I. Response II. Amplification III. Reception IV. Transduction Which of the following represents the sequence of events in a typical signal transduction pathway?

  • I, II, III, IV
  • III, I, IV, II
  • II, IV, I, III
  • III, IV, II, I

  • 6. 
    Why is apoptosis required?

  • Glycolysis
  • Cell division: Meiosis and mitosis
  • Growth and elimination of threats such as viruses and DNA damage

  • 7. 
    Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to

  • the active site of an enzyme in the cytoplasm that binds to a specific substrate.
  • RNA specifying the amino acids in a polypeptide.
  • genes making up a chromosome.
  • an enzyme with an optimal pH and temperature for activity.

  • 8. 
    Which letter represents the cell membrane?

  • A
  • B
  • C
  • D
  • E

  • 9. 
    The 3 steps of signal transduction in order are

  • reception, transduction, response
  • response, transduction, reception
  • reception, response, transduction
  • transduction, reception, response

  • 10. 
    In cell signaling, how is the flow of specific ionsregulated?

  • Opening and closing of ligand-gated channels
  • Transduction
  • Cytoskeleton rearrangement
  • Endocytosis

  • 11. 
    What determines whether a cell is a target cell for a particular signal molecule?

  • phosphorylation cascade
  • cAMP
  • signal receptors
  • phosphatase

  • 12. 
    Which areas in the diagram depict the process of transduction in the signal transduction pathway of cell communication?

  • Q and R
  • Q and U
  • S and T
  • T and U

  • 13. 
    For cells to stay alive they require what type of SA:V?

  • Large SA, Large V
  • Small SA, Large V
  • Large SA, Small V
  • Small SA, Small V

  • 14. 
    The three steps of signal transduction in order are

  • reception, transduction, response
  • response, transduction, reception
  • reception, response, transduction
  • transduction, reception, response

  • 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?

  • i, ii, iii, iv
  • iii, i, iv, ii
  • ii, iv, i, iii
  • iii, iv, ii, i

  • 16. 
    A signal molecule that binds to a plasma membrane proteis is a

  • ligand
  • second messenger
  • protein kinase
  • receptor protein

  • 17. 
    What could happen to target cells in an animal that lack receptor for local regulators?

  • They could compensate by receiving nutrients via an α factor.
  • They could develop normally in response to neurotransmitters instead.
  • They could divide but never reach full size.
  • They would not be able to multiply in response to growth factors from nearby cells.

  • 18. 
    The general name for an enzyme that transfers phosphate groups from ATP to a protein is __________.

  • protein dehydrogenase
  • protein kinase
  • protein phosphatase
  • peptidase
  • protein cyclase

  • 19. 
    How can surface area (SA) be increased?

  • Grow larger
  • Divide into smaller pieces

  • 20. 
    Long distance signaling molecules are known as what?

  • paracrine
  • endocrine
  • hormones
  • gap junctions

  • 21. 
    Which is not a signaling step?

  • reception
  • transduction
  • response
  • second messaging

  • 22. 
    When epinephrine binds to cardiac muscle cells, it speeds their contraction. When it binds to muscle cells of the small intestine, it inhibits their contraction. Which of the following best accounts for the fact that the same hormone can have different effects on muscle cells.

  • Cardiac cells have more receptors for epinephrine than do intestinal cells.
  • Epinephrine circulates to the heart first and thus is in higher concentration around cardiac cells.
  • The two types of muscle cells have different pathways for epinephrine and thus have different cellular responses.
  • Cardiac muscle is stronger than intestinal muscle and thus has a stronger response to epinephrine.

  • 23. 
    Which of the following cell organelle actively participates in animal apoptosis?

  • Nucleus
  • Mitochondria
  • Lysosomes
  • Vacuoles

  • 24. 
    What could be the cause for a cell to undergo apoptosis?

  • DNA damage
  • Radiation
  • Nutrient deficiency
  • All of the above

  • 25. 
    Give the correct sequence of apoptosis:Nucleus begins to breakNucleus condensation and formation of blebPhagocytosis of apoptotic bodies

  • 1,2,3
  • 2,3,1
  • 3,2,1
  • 2,1,3

  • 26. 
    Apoptosis can't kill which of the following?

  • Cell infected with viruses
  • Cell with DNA damage
  • Cancer cells
  • Immune cells
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