Establishment of Membrane Potentials
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Questions and Answers

What is the result of K+ ions diffusing out of the cell?

  • The inside of the cell becomes relatively positive
  • The outside of the cell becomes relatively negative
  • The inside of the cell becomes relatively negative (correct)
  • There is no change in the cell's polarity

    • What is the consequence of Na+ ions diffusing into the cell?

  • The inside of the cell becomes relatively positive (correct)
  • There is no change in the cell's polarity
  • The inside of the cell becomes relatively negative
  • The outside of the cell becomes relatively positive

    • In nerve diffusion potentials, what is the role of K+ ions?

  • Diffuses into the cell, leaving the inside positive
  • Causes an equal distribution of charge inside and outside the cell
  • Diffuses out of the cell, leaving the inside negative (correct)
  • Has no effect on the cell's polarity

    • How does the direction of diffusion potential depend on the relative concentrations of ions inside vs outside the cell?

    <p>It determines whether the inside becomes relatively positive or negative</p> Signup and view all the answers

    Potassium diffusion potential is established when K+ ions diffuse into the cell, leaving it relatively negative inside.

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

    Sodium diffusion potential is established when only Na+ ions can diffuse out of the cell, leaving it relatively positive inside.

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

    The direction of the diffusion potential depends only on the concentration of the ion involved inside vs outside the cell.

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

    In nerve diffusion potentials, K+ ions have a higher concentration outside cells and diffuse in, leaving the inside positive.

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

    What is the primary function of the plasma membrane?

    <p>Regulates the passage of substances in and out of the cell</p> Signup and view all the answers

    What is the gel-like substance in the cytoplasm called?

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

    Which organelle is responsible for protein modification and sorting within the cell?

    <p>Golgi apparatus</p> Signup and view all the answers

    What is the main constituent of the plasma membrane?

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

    Where is the genetic material found within a typical cell?

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

    Which component of the cell fills the space between the nucleus and the cell membrane?

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

    What is the primary function of the nucleolus?

    <p>Producing ribosomes</p> Signup and view all the answers

    Which organelle is often referred to as the powerhouse of the cell?

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

    What is the main function of the endoplasmic reticulum (ER)?

    <p>Synthesizing proteins and lipids</p> Signup and view all the answers

    Which statement best describes the function of the Golgi apparatus?

    <p>Packaging and distributing molecules</p> Signup and view all the answers

    What is the role of the cell membrane in regulating the passage of substances?

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

    Which organelle is responsible for producing ribosomes?

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

    What is the function of the fluid mosaic model in the cell membrane?

    <p>Adapting to environmental changes</p> Signup and view all the answers

    Which organelle plays a role in lipid metabolism and detoxification?

    <p><strong>Smooth endoplasmic reticulum (ER)</strong></p> Signup and view all the answers

    What is the crucial function of the cell membrane?

    <p><strong>Regulating the passage of substances</strong></p> Signup and view all the answers

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