Cell Signaling and Receptors
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Questions and Answers

What is a necessary step for hydrophilic extracellular signal molecules to induce a response in target cells?

  • They must bind to a cell-surface receptor (correct)
  • They must travel through the plasma membrane on their own
  • They must be transported into the cytosol by their receptor
  • They must bind to a receptor in the cytosol

    • What is a common characteristic of all extracellular signal molecules?

  • They are always transported into the cytosol
  • They are always recognized by the immune system
  • They must bind to a cell-surface receptor (correct)
  • They are always hydrophobic

    • What is the relationship between a cell-surface receptor and the response it mediates?

  • Receptors have no influence on the response of a cell
  • A single receptor can mediate only one response
  • Multiple receptors can mediate a single response
  • A single receptor can mediate multiple responses (correct)

    • What is the response of a cell when a foreign substance binds to a receptor for a normal signal molecule?

    <p>A different response than the normal signal molecule (B)</p> Signup and view all the answers

    What is the function of a receptor in signal transduction?

    <p>To bind to signal molecules and transmit a signal (B)</p> Signup and view all the answers

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