Cell Signaling Pathways and Communication Methods Quiz
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Questions and Answers

Which of the following is NOT considered a chemical messenger in cellular communication?

  • Neurotransmitters
  • Steroid hormones
  • Odorants
  • Light stimuli (correct)

    • Which type of messengers can diffuse across the plasma membrane and interact with cytosolic or nuclear receptors?

  • Growth factors
  • Odorants
  • Steroid hormones (correct)
  • Neurotransmitters

    • What do chemical messengers typically interact with on the cell surface to trigger a cascade of secondary events?

  • Cell surface receptors (correct)
  • Cytosolic or nuclear receptors
  • Intracellular second-messenger systems
  • Diffusible intracellular systems

    • Which of the following is NOT a method of cell communication described in the text?

    <p>Summation and integration of input from multiple signaling pathways</p> Signup and view all the answers

    What is the main function of adhering junctions?

    <p>To maintain normal cell architecture and organize groups of cells into tissues</p> Signup and view all the answers

    Which of the following is true about tight junctions?

    <p>They stabilize the complex and have a signaling role</p> Signup and view all the answers

    What is the role of membrane-associated ligands in cell communication?

    <p>To provide spatial clues in migrating cells</p> Signup and view all the answers

    Which of the following is true about second messengers?

    <p>Second messengers amplify signals</p> Signup and view all the answers

    What is the function of counterbalancing activities in second-messenger systems?

    <p>To return the system to a resting state</p> Signup and view all the answers

    How does cAMP concentration increase in a cell?

    <p>By activating adenylyl cyclase</p> Signup and view all the answers

    What is the role of second-messenger systems in a multicellular organism?

    <p>To integrate responses to stressful situations</p> Signup and view all the answers

    Which type of receptor is involved in signaling between electrically excitable cells?

    <p>Ligand-gated ion channels</p> Signup and view all the answers

    Which type of receptor works indirectly through an intermediary to activate or inactivate a separate membrane-associated enzyme or channel?

    <p>G protein–coupled receptors</p> Signup and view all the answers

    What are the two types of weak, noncovalent interactions involved in the binding of a ligand to its receptor?

    <p>Ionic bonds, van der Waals interactions, and hydrophobic interactions</p> Signup and view all the answers

    What is the final consequence of ligand binding to a receptor?

    <p>Activation of a catalytic cascade</p> Signup and view all the answers

    Which of the following is NOT a function of cellular communication described in the text?

    <p>Maintenance of cellular homeostasis</p> Signup and view all the answers

    What type of messengers can interact with cytosolic or nuclear receptors?

    <p>Hydrophobic messengers</p> Signup and view all the answers

    What is the main role of second-messenger systems in cellular communication?

    <p>To mediate the cell's response to a stimulus</p> Signup and view all the answers

    Which of the following is an example of a second messenger?

    <p>cAMP</p> Signup and view all the answers

    Which of the following is NOT a function of second messengers?

    <p>Regulate the concentration of ligands</p> Signup and view all the answers

    Which of the following is true about ligands that activate the same signaling pathways in cells?

    <p>They always produce the same effect</p> Signup and view all the answers

    How do second-messenger systems allow specificity and diversity in cell signaling?

    <p>By interacting with distinct receptors</p> Signup and view all the answers

    Which type of receptor is located in the cytosol or nucleus and is activated by a ligand to modulate gene expression?

    <p>Nuclear receptors</p> Signup and view all the answers

    What is the first step in the signaling events initiated by plasma membrane receptors?

    <p>Recognition of the signal by its receptor</p> Signup and view all the answers

    What are the four categories of receptors based on their associated mechanisms of signal transduction?

    <p>Ligand-gated ion channels, G protein-coupled receptors, Catalytic receptors, Nuclear receptors</p> Signup and view all the answers

    What is the final consequence of ligand binding to a receptor?

    <p>Activation of a catalytic cascade</p> Signup and view all the answers

    Which of the following is true about gap junctions?

    <p>They are regulated by changes in cytosolic concentrations of Ca2+, cAMP, and H+</p> Signup and view all the answers

    What is the main function of adhering junctions?

    <p>To provide important clues for the maintenance of normal cell architecture</p> Signup and view all the answers

    What is the role of tight junctions?

    <p>To create a diffusion barrier between adjacent cells</p> Signup and view all the answers

    What is the function of membrane-associated ligands in cell communication?

    <p>To interact with a receptor in the plasma membrane of an adjacent cell</p> Signup and view all the answers

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