Proteins and Cell Membrane Transport
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Proteins and Cell Membrane Transport

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@ChasteRabbit

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Questions and Answers

What percentage of proteins in the plasma membrane are integral/intrinsic proteins?

  • 90% (correct)
  • 30%
  • 50%
  • 70%
  • What type of transport requires energy and moves substances against the concentration gradient?

  • Passive diffusion
  • Osmosis
  • Active transport (correct)
  • Facilitated diffusion
  • Which type of protein movement was confirmed by the 1972 Singer & Nicolson model for the plasma membrane?

  • Flip-flop movement
  • Lateral movement (correct)
  • Rotational movement
  • None of the above
  • What is the main example of a channel protein involved in facilitated diffusion?

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

    What is the role of glycoproteins on the cell surface?

    <p>Helps in cell-to-cell recognition</p> Signup and view all the answers

    Study Notes

    Protein Classification

    • Peripheral proteins make up 10% of membrane proteins, while integral proteins make up 90%
    • Integral proteins are transmembrane or in-wall, meaning they span across the membrane or are embedded in it

    Transport Mechanisms

    Passive Transport

    • Occurs along the concentration gradient, requiring no energy
    • Examples include passive diffusion, where molecules move from an area of higher concentration to an area of lower concentration

    Facilitated Diffusion

    • Involves the use of channel proteins or carrier proteins to facilitate transport
    • Channel proteins form a pore or channel in the membrane, allowing specific molecules to pass through
    • Examples include porin proteins

    Active Transport

    • Transport occurs against the concentration gradient, requiring energy consumption
    • Examples include the Na+ pump, which transports sodium ions into the cell against their concentration gradient

    Osmosis

    • Movement of water molecules from an area of higher concentration to an area of lower concentration
    • Occurs through a selectively permeable membrane, allowing polar molecules like water to pass through

    Plasma Membrane

    • Discovered by Singer and Nicolson in 1972
    • Labeling proteins on the membrane surface confirms the fluid mosaic model, where proteins are able to move laterally but do not flip-flop across the membrane

    Glycoproteins and Cell Recognition

    • Glycoproteins, or sugar-proteins, are important for cell-to-cell recognition
    • They provide mobility and flexibility to the cell surface, allowing for interactions with other cells

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    Description

    This quiz covers the types of proteins and their roles in cell membrane transport, including peripheral and integral proteins, passive and active transport, facilitated diffusion, and osmosis.

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