COPY: Quiz 11
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Questions and Answers

Which of these macromolecules is NOT commonly found in the plasma membrane?

  • carbohydrates
  • proteins
  • nucleic acids (correct)
  • fatty acids
  • Plasma membrane proteins that move ions in and out of cells using active transport are called

  • transporters. (correct)
  • channels.
  • anchors.
  • receptors.
  • If a phospholipid is located in the outer layer of the bilayer in a vesicle, where will it end up when the vesicle fuses with the plasma membrane?

  • the cytosolic face of the bilayer (correct)
  • the extracellular face the bilayer
  • randomly on one side or another
  • Vesicles cannot fuse with the plasma membrane.
  • The fluidity of a membrane is increased by

    <p>Unsaturated fatty acids</p> Signup and view all the answers

    A cell membrane made up primarily of lipids with which characteristics would be the least fluid (i.e., most stiff)?

    <p>long, saturated fatty acid tails and cholesterol</p> Signup and view all the answers

    Where are new phospholipids made?

    <p>endoplasmic reticulum</p> Signup and view all the answers

    Detergent molecules are ___________ in nature and bind with membrane proteins and membrane lipids to disrupt their interactions and release the proteins from the membrane.

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

    In a fluorescence recovery after photobleaching (FRAP) experiment, a fluorescently tagged membrane protein, A, shows very little recovery of fluorescence ten minutes after photobleaching, while membrane protein B shows a rapid increase in fluorescence after bleaching, recovering nearly 80% of its original fluorescent signal by ten minutes. Based on this information, which of the following statements can be made?

    <p>Protein B is diffusing in a more fluid membrane.</p> Signup and view all the answers

    Which type of movement is the least common for lipids in a bilayer?

    <p>flip-flop</p> Signup and view all the answers

    How is the protein shown in the diagram associated with the plasma membrane?

    <p>It is associated with one layer of the lipid bilayer.</p> Signup and view all the answers

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