WK 2: Cell Membranes
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Questions and Answers

What is the primary function of compartmentalization in cells?

  • To transport specific molecules across the membrane
  • To separate 'self' from the environment and separate vital functions (correct)
  • To facilitate communication between cells
  • To regulate cell-cell interactions

    • Which of the following is NOT a function of the plasma membrane?

  • Photosynthesis (correct)
  • Selective permeability
  • Recognition of antigens
  • Transport of specific molecules

    • What is the primary purpose of the plasma membrane surrounding the entire cell?

  • To recognize antigens and foreign cells
  • To transduce extracellular signals into intracellular events
  • To act as a barrier between the cytoplasm and external environment (correct)
  • To regulate cell-cell interactions

    • Which of the following organelles is NOT membrane-enclosed?

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

    What is the role of membrane proteins in the plasma membrane?

    <p>To facilitate transport of specific molecules across the membrane</p> Signup and view all the answers

    Why is it necessary for compounds to cross cell membranes?

    <p>For communication between compartments and cells</p> Signup and view all the answers

    What is the function of the plasma membrane in terms of extracellular signals?

    <p>To transduce extracellular physical or chemical signals into intracellular events</p> Signup and view all the answers

    What is the main function of cholesterol in cell membranes?

    <p>To alter the molecular packing of phospholipids</p> Signup and view all the answers

    What is the approximate diameter of microdomains in cell membranes?

    <p>70 nanometers</p> Signup and view all the answers

    What type of lipid is responsible for determining blood types?

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

    What is the primary component of phospholipid membranes?

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

    What is the function of adhesion proteins in cell membranes?

    <p>To hold cells together</p> Signup and view all the answers

    What is an example of a type of phospholipid?

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

    What is the function of receptor proteins in cell membranes?

    <p>To recognize and bind to specific molecules</p> Signup and view all the answers

    What type of molecules can pass through gap junctions?

    <p>Molecules up to 500 Da in size</p> Signup and view all the answers

    What is the main difference between symport and antiport?

    <p>Symport transports molecules in the same direction, while antiport transports molecules in opposite directions</p> Signup and view all the answers

    What is the primary function of receptor proteins in cell membranes?

    <p>To recognize and respond to specific signals</p> Signup and view all the answers

    What type of proteins are attached to the membrane through a covalently attached fatty acid?

    <p>Lipid-anchored proteins</p> Signup and view all the answers

    What is the term for the movement of molecules from an area of higher concentration to an area of lower concentration?

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

    What is the purpose of cholesterol in cell membranes?

    <p>To regulate the fluidity of the membrane</p> Signup and view all the answers

    What type of ion channels are generally open all the time?

    <p>Ungated ion channels</p> Signup and view all the answers

    What is the term for the movement of water molecules across the membrane from an area of higher concentration to an area of lower concentration?

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

    What is the main function of phospholipids in cell membranes?

    <p>To form the main component of cell membranes</p> Signup and view all the answers

    What is the effect of cholesterol on the permeability of the cell membrane?

    <p>It decreases the permeability of the membrane</p> Signup and view all the answers

    What is the characteristic of microdomains in cell membranes?

    <p>They are small regions rich in sphingolipids and cholesterol</p> Signup and view all the answers

    What is the function of glycolipids in cell membranes?

    <p>They determine the blood type of an individual</p> Signup and view all the answers

    What is the arrangement of phospholipids in the cell membrane?

    <p>They are arranged in an asymmetrical bilayer</p> Signup and view all the answers

    What is the function of transport proteins in cell membranes?

    <p>They facilitate the transport of molecules across the membrane</p> Signup and view all the answers

    What is the source of lecithin, a type of phospholipid?

    <p>Egg yolks and soybeans</p> Signup and view all the answers

    What is a primary function of the plasma membrane?

    <p>To separate self from the environment</p> Signup and view all the answers

    What is a characteristic of cell membranes?

    <p>Selective permeability</p> Signup and view all the answers

    What is the purpose of compartmentalization in cells?

    <p>To separate and optimize vital functions</p> Signup and view all the answers

    What is necessary for communication between compartments and cells?

    <p>Compounds crossing membranes</p> Signup and view all the answers

    What is a function of membrane proteins in the plasma membrane?

    <p>To regulate the passage of molecules</p> Signup and view all the answers

    What is a characteristic of eukaryotic cells?

    <p>The presence of the same basic set of membrane-enclosed organelles</p> Signup and view all the answers

    What is a function of the plasma membrane in terms of extracellular signals?

    <p>To transduce extracellular physical or chemical signals into intracellular events</p> Signup and view all the answers

    What is the function of transport proteins in cell membranes?

    <p>To facilitate the movement of molecules across the membrane</p> Signup and view all the answers

    What type of proteins are involved in cell-cell recognition and adhesion?

    <p>Adhesion proteins</p> Signup and view all the answers

    What is the function of aquaporins in the plasma membrane?

    <p>To facilitate water transport through the membrane</p> Signup and view all the answers

    What is the term for the movement of ions across the membrane?

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

    What type of proteins are involved in cell signaling and receiving external signals?

    <p>Communication proteins</p> Signup and view all the answers

    What is the primary function of ion channels in the plasma membrane?

    <p>To regulate the movement of ions across the membrane</p> Signup and view all the answers

    What is the function of gap junctions in cell membranes?

    <p>To allow the passage of small molecules between adjacent cells</p> Signup and view all the answers

    What is the term for the movement of molecules from an area of higher concentration to an area of lower concentration?

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

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