Introduction to Cell Signaling in Physiology: Receptors and Signaling Pathways
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Questions and Answers

What type of proteins play a critical role in immune defenses and primarily signal through receptors linked to JAK kinases?

  • Cytokines (correct)
  • G Protein-Coupled Receptors
  • Ion Channels
  • Enzymes
  • Which subunit of G proteins can bind both GDP and GTP?

  • Delta subunit
  • Alpha subunit (correct)
  • Gamma subunit
  • Beta subunit
  • What happens to the alpha subunit of a G protein when it binds to GTP?

  • It links up with an enzyme
  • It becomes inactive
  • It dissociates from the beta and gamma subunits (correct)
  • It binds to the receptor
  • What is the function of beta and gamma subunits in G proteins?

    <p>Anchor the alpha subunit in the membrane</p> Signup and view all the answers

    Which proteins are termed plasma membrane effector proteins for their role in mediating cell responses?

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

    What happens to the activated alpha subunit of a G protein after dissociating from beta and gamma subunits?

    <p>It links up with an ion channel or enzyme</p> Signup and view all the answers

    Which proteins are associated with receptors in signaling pathways involving multiple distinct members like G proteins?

    <p>G-Protein-Coupled Receptors</p> Signup and view all the answers

    What happens to the affinity of the alpha subunit of a G protein when the receptor is activated?

    <p>It increases for GTP</p> Signup and view all the answers

    What is the name given to the family of heterotrimeric proteins located on the cytosolic surface of the plasma membrane associated with G-Protein-Coupled Receptors?

    <p>G Proteins</p> Signup and view all the answers

    What proteins play a critical role in immune defenses and signal via receptors linked to JAK kinases?

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

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