Acetylcholine Receptor Interaction Quiz
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Questions and Answers

What happens when a messenger binds to a receptor directly?

  • Modifies the receptor
  • Causes the cellular response to the messenger (correct)
  • Inhibits the cellular response
  • Leads to production of a second messenger

    • How does messenger binding to a receptor resemble substrate binding to an enzyme?

  • Both involve conformational changes in proteins (correct)
  • Both involve inhibition by antagonists
  • Both cause production of a second messenger
  • Both lead to negative responses in tissues

    • What determines the response of a cell to a messenger?

  • The type of receptor
  • The type of messenger
  • The number of receptors occupied (correct)
  • The tissue in which the receptor is located

    • Why can very low concentrations of messengers give a massive response in cells?

    <p>Due to high dissociation constant between ligand-receptor interaction (B)</p> Signup and view all the answers

    What is released from the adrenal glands during stress?

    <p>L (B)</p> Signup and view all the answers

    Which reaction occurs as a result of the L-R contact interaction?

    <p>Fight/Flight primitive reaction (B)</p> Signup and view all the answers

    What is the role of G-protein in cell signaling?

    <p>Stimulates or inhibits intracellular enzymes (A)</p> Signup and view all the answers

    Which ligand is bound in the ligand position of rhodopsin for vision?

    <p>Carotenoid molecule related to vitamin A (D)</p> Signup and view all the answers

    What is the role of IP3 in signal transduction?

    <p>Releases Ca2+ from the endoplasmic reticulum (A)</p> Signup and view all the answers

    Which protein does diacylglycerol (DG) activate in signal transduction?

    <p>Protein kinase c (B)</p> Signup and view all the answers

    How is an external message transferred into the cell interior in signal transduction?

    <p>By changes in the electrical properties of the membrane (B)</p> Signup and view all the answers

    What type of channels are involved in store-gated channels, according to the text?

    <p>Ca2+ ions channels (A)</p> Signup and view all the answers

    What is the role of cholinesterase activity of the receptor?

    <p>Hydrolyzing acetylcholine (D)</p> Signup and view all the answers

    What happens when acetylcholine binds to the receptor on the cell membrane?

    <p>The channel opens, allowing Na and K ions to flow through (A)</p> Signup and view all the answers

    What is the function of cyclic AMP (cAMP) as a second messenger?

    <p>Mediating cellular responses (C)</p> Signup and view all the answers

    What controls the adenyl cyclase enzyme in the amplification system?

    <p>Gs and Gi membrane G-protein complexes (B)</p> Signup and view all the answers

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