2.5 Membrane Permeability

Cards (23)

  • What does membrane permeability refer to?
    Degree substances pass through
  • Large polar molecules like glucose can freely pass through the cell membrane.
    False
  • Passive transport moves substances down their concentration gradient
  • Match the phospholipid property with its effect on permeability:
    Hydrophilic head ↔️ Allows polar and charged molecules through
    Hydrophobic tails ↔️ Permits small, nonpolar molecules
    Asymmetry ↔️ Creates semi-permeable barrier
  • Arrange the mechanisms of passive transport from simplest to most complex:
    1️⃣ Simple diffusion
    2️⃣ Osmosis
    3️⃣ Facilitated diffusion
  • Passive transport moves substances against their concentration gradient.
    False
  • A semi-permeable membrane restricts substance passage based on their size
  • The hydrophobic tails of phospholipids permit the passage of small, nonpolar molecules.

    True
  • Match the type of passive transport with its description:
    Simple diffusion ↔️ Movement of small, nonpolar molecules
    Facilitated diffusion ↔️ Uses membrane proteins for transport
    Osmosis ↔️ Movement of water across the membrane
  • Primary active transport directly uses ATP to pump molecules
  • Large, polar, and water-soluble molecules require specialized mechanisms to cross the cell membrane.
  • A semi-permeable membrane selectively permits substances based on their size, charge, and solubility
  • Arrange the factors affecting membrane permeability from most to least significant based on the material:
    1️⃣ Substance size
    2️⃣ Substance charge
    3️⃣ Substance solubility
  • Active transport requires energy to move substances against their concentration gradient.

    True
  • What roles do membrane proteins play in membrane permeability?
    Channels, pumps, receptors
  • Primary active transport directly uses ATP
  • What is a semi-permeable membrane in cell biology?
    A membrane that selectively allows substances to pass through
  • What is the primary component of a cell membrane?
    Phospholipid bilayer
  • Membrane proteins regulate permeability by acting as channels, pumps, and receptors
  • What is required for active transport to occur?
    ATP energy
  • Passive transport moves substances against their concentration gradient.
    False
  • Which molecules cannot pass through a cell membrane due to their size?
    Glucose and amino acids
  • Disruption of membrane permeability can lead to cell dysfunction and disease.

    True