Cell Membranes and Membrane Transport: Ion Channels and Aquaporins
18 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary difference between simple diffusion and carrier-mediated transport in terms of kinetics?

  • The rate of uptake of carrier-mediated transport is dependent on the external concentration of the substrate, whereas simple diffusion is not. (correct)
  • Carrier-mediated transport is limited by the concentration of the substrate, whereas simple diffusion is not.
  • Simple diffusion is always faster than carrier-mediated transport.
  • Simple diffusion is a more selective process than carrier-mediated transport.

    • What is the function of a selective carrier protein in facilitated diffusion?

  • To decrease the rate of uptake of the solute.
  • To increase the concentration gradient of the solute.
  • To inhibit the transport of the solute.
  • To undergo a conformational change to allow the passage of the solute. (correct)

    • What is the term for the transport of one solute coupled with the transport of another solute in the same direction?

  • Symport. (correct)
  • Facilitated diffusion.
  • Uniport.
  • Antipport.

    • What is the relationship between the Km of a transporter and its affinity for the substrate?

    <p>The lower the Km, the higher the affinity.</p> Signup and view all the answers

    What is the term for the transport of a solute out of the cell coupled with the transport of another solute into the cell?

    <p>Antipport.</p> Signup and view all the answers

    What is the name of the family of transporters that mediate facilitated glucose transport?

    <p>GLUT1-12.</p> Signup and view all the answers

    What is the primary source of energy for primary active transport?

    <p>Hydrolysis of ATP</p> Signup and view all the answers

    What is the net result of the Na+/K+-ATPase pump in the plasma membrane?

    <p>Establishing a high concentration of Na+ outside the cell and a high concentration of K+ inside the cell</p> Signup and view all the answers

    What is the role of insulin in regulating GLUT4?

    <p>Insulin promotes the translocation of GLUT4 to the plasma membrane</p> Signup and view all the answers

    Which type of transport does not require energy?

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

    What is the result of the phosphorylation of the Na+/K+-ATPase pump?

    <p>A conformational change that releases Na+ to the exterior</p> Signup and view all the answers

    What is the function of the Ca2+-ATPase pump in the endoplasmic/sarcoplasmic reticulum?

    <p>To regulate the concentration of Ca2+ in the endoplasmic/sarcoplasmic reticulum</p> Signup and view all the answers

    What is the primary mechanism by which solutes move from one side of the membrane to the other along their concentration gradient?

    <p>Facilitated diffusion</p> Signup and view all the answers

    Which type of transport involves the movement of solutes against their concentration gradient, requiring energy expenditure?

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

    What is the role of the octanol-water partition coefficient (Kow) in membrane transport?

    <p>It determines the lipid solubility of a molecule</p> Signup and view all the answers

    Which type of transporter is responsible for the transmembrane movement of ions and hydrophilic molecules?

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

    What is the characteristic of a symporter?

    <p>It moves ions and molecules in the same direction</p> Signup and view all the answers

    Which statement is true about the Na+/K+ ATPase transporter?

    <p>It uses ATP hydrolysis to pump Na+ and K+</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser