Cell Biology: Membrane Proteins and Factors Affecting Membrane Fluidity
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Cell Biology: Membrane Proteins and Factors Affecting Membrane Fluidity

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Questions and Answers

What effect does the addition of cholesterol have on animal cell membranes?

  • Increase membrane permeability to polar molecules
  • Increase fluidity
  • Decrease fluidity
  • Decrease membrane permeability to water (correct)

    • How do cis-double bonds in phospholipids affect membrane fluidity at lower temperatures?

  • Increase fluidity (correct)
  • Decrease fluidity
  • Increase lipid tail interactions
  • Increase tight packing

    • What is the impact of shorter hydrocarbon tails in phospholipids on membrane fluidity at lower temperatures?

  • Increase fluidity (correct)
  • Increase lipid tail interactions
  • Increase tight packing
  • Decrease fluidity

    • Which factor decreases the mobility of phospholipid tails in the lipid bilayer?

    <p>Adding cholesterol</p> Signup and view all the answers

    In terms of fluidity, what is the primary role of phospholipid tail length in the membrane?

    <p>Increase fluidity</p> Signup and view all the answers

    How does the presence of cis-double bonds affect membrane fluidity?

    <p>Increase fluidity at higher temperatures</p> Signup and view all the answers

    What is the primary function of liposomes?

    <p>Facilitate drug delivery into cells</p> Signup and view all the answers

    In a phospholipid bilayer, which part of the phospholipid interacts with water?

    <p>Polar head group</p> Signup and view all the answers

    Cell membrane fluidity is carefully regulated because it is important for which of the following?

    <p>Ensuring proper membrane function</p> Signup and view all the answers

    What happens to phospholipids within each leaflet in terms of movement in a cell membrane?

    <p>They rapidly diffuse between leaflets</p> Signup and view all the answers

    Which technique is used to manipulate the cell membrane without causing damage?

    <p>Laser tweezers</p> Signup and view all the answers

    What structures can pure phospholipids form according to the text?

    <p>Closed, spherical liposomes</p> Signup and view all the answers

    Why do enzymes in the ER membrane flip lipids from one leaflet to the other?

    <p>To maintain the asymmetry of the lipid bilayer</p> Signup and view all the answers

    Which protein catalyzes rapid flip-flop of random phospholipids from one leaflet to the other?

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

    What is the function of phospholipids synthesized in the cytosolic leaflet of the endoplasmic reticulum?

    <p>Maintain membrane asymmetry</p> Signup and view all the answers

    What is the role of glycolipids in the lipid bilayer of an animal cell plasma membrane?

    <p>Signal transduction</p> Signup and view all the answers

    How are phospholipids and glycolipids distributed in the lipid bilayer of an animal cell plasma membrane?

    <p>Unequally distributed in an organized manner</p> Signup and view all the answers

    What property of membranes do glycoprotein membranes retain during transfer between cell compartments?

    <p>Membrane asymmetry</p> Signup and view all the answers

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