Membrane Structure and Function: Inbound and Outbound Traffic Regulation
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Questions and Answers

What type of transport does not require an input of energy and may involve transport proteins?

  • Active transport
  • Bulk transport
  • Passive transport (correct)
  • Endocytosis

    • What type of molecules are phospholipids?

  • Hydrophobic (correct)
  • Hydrophilic
  • Non-polar
  • Polar

    • According to the text, what are the main components of cellular membranes?

  • Lipids and proteins (correct)
  • Proteins and carbohydrates
  • Phospholipids and carbohydrates
  • Lipids and phospholipids

    • What is the main role of phospholipids in the cell membrane?

    <p>To create a bilayer with hydrophobic tails and hydrophilic heads</p> Signup and view all the answers

    Which type of transport requires both energy and a transport protein?

    <p>Active transport</p> Signup and view all the answers

    What process involves the movement of large molecules through the cell membrane using bulk transport mechanisms?

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

    What is the effect of cholesterol on membrane fluidity at warm temperatures?

    <p>It restrains the movement of phospholipids</p> Signup and view all the answers

    What primarily holds membranes together?

    <p>Weak hydrophobic interactions</p> Signup and view all the answers

    In what conditions do membranes switch from a fluid state to a solid state?

    <p>At low temperatures</p> Signup and view all the answers

    What is the role of proteins in the cell membrane?

    <p>To determine most of the membrane's functions</p> Signup and view all the answers

    Which lipid component contributes to membrane fluidity?

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

    What is the primary orientation of hydrophilic regions of membrane proteins?

    <p>Toward the cytosol and extracellular fluid</p> Signup and view all the answers

    What effect do unsaturated phospholipids have on membrane composition during winter in organisms?

    <p>They prevent membrane solidification during winter</p> Signup and view all the answers

    What is the main role of cholesterol in animal cell membranes at cool temperatures?

    <p>To prevent membrane solidification</p> Signup and view all the answers

    What are membranes mainly composed of?

    <p>Lipid bilayers with amphipathic proteins</p> Signup and view all the answers

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