Cell Membrane Structure and Function
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Questions and Answers

What describes the net movement of a solvent across a selectively permeable membrane?

  • Diffusion
  • Osmosis (correct)
  • Active transport
  • Facilitated diffusion
  • Which type of protein allows the movement of water through the cell membrane?

  • Enzyme protein
  • Channel protein (correct)
  • Carrier protein
  • Glycoprotein
  • What is the force that could oppose the movement of water across a membrane due to osmosis?

  • Ionic bonds
  • Gravity (correct)
  • Covalent bonds
  • Hydrogen bonding
  • Which transport process uses the energy of ATP to move molecules across the cell membrane?

    <p>Primary active transport</p> Signup and view all the answers

    What is the term used to describe the tendency of a solution to draw water in by osmosis?

    <p>Osmotic pressure</p> Signup and view all the answers

    What is the function of the hydrophilic regions in a cell membrane?

    <p>To interact with the watery environment inside or outside the cell</p> Signup and view all the answers

    What is the primary function of a carrier protein in the cell membrane?

    <p>To bind to specific proteins and transport them across the membrane</p> Signup and view all the answers

    Which type of molecular movement occurs when there is no longer a concentration gradient?

    <p>Net movement stops</p> Signup and view all the answers

    What is the main difference between simple diffusion and facilitated diffusion?

    <p>Simple diffusion involves movement of molecules without assistance, facilitated diffusion requires carrier proteins</p> Signup and view all the answers

    What is the role of channel proteins in the cell membrane?

    <p>To form openings for certain molecules to pass through based on their shape and charge</p> Signup and view all the answers

    Why are lipids and embedded proteins crucial for maintaining homeostasis in cells?

    <p>To support active maintenance of a stable environment</p> Signup and view all the answers

    What is the main reason for the dynamic nature of cell membranes?

    <p>The ability of membrane lipids to move</p> Signup and view all the answers

    How does cholesterol affect membrane fluidity at high temperatures?

    <p>Decreases membrane fluidity</p> Signup and view all the answers

    Which type of fatty acid tails results in a more fluid membrane?

    <p>Fewer carbon to carbon double bonds</p> Signup and view all the answers

    What role do transporters play in cell membranes?

    <p>Move ions or molecules across the membrane</p> Signup and view all the answers

    Which kind of protein spans the entire lipid bilayer?

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

    How do channel proteins differ from carrier proteins in cell membranes?

    <p>Channel proteins move ions/molecules across membranes passively, while carrier proteins require energy.</p> Signup and view all the answers

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