3 triglycerides

    Cards (9)

    • cholesterol?

      restricts the movement of other molecules making up the membrane and increases strength and stability of membranes by making them less flexible. Helps to prevent loss of water
    • glycolipids?

      made of carbohydrates and glycolipids covalently bonded to each other, also act as a recognition site, helping to maintain the staility of the mebrane
    • glycoprotein?

      short branching carbohydrate chains are attached to the proteins in the membrane.These glycoproteins act as receptors for hormones and neurotransmitters or antigens
    • fluid mosaic?
      membrane proteins floating around in the structure. Extrinsic is hen the proteins may be in one layer and (intrinsic) proteins across the whole layer
    • which substances would be able to move through the hydrophilic channels?
      large polar substance soluble such as glucose ions and amino acids.
    • diffusion and osmosis are passive processes
    • Factors affecting the rate of diffusion?

      - the surface area over which diffusion occurs
      - the thickness of the exchange surface
      - the concentration gradient
      - the size of the diffusing molecule
      - temperature
      - water solubility/polarity
    • to increase diffusion rate?
      maximise the surface area
      maximise the concentration difference
      maximise the thickness if exchange surface
    • what molecules will be able to move through the phospholipid bilayer by simple diffusion and why?
      molecules that are non polar will be able to diffuse across the mebrane because they are lipid soluble and will not be repelled by the fatty acids in the hydrophobic tails. Smaller molecules can also diffuse through more easily as they can fit between phospholipid molecules such as oxygen molecules. They are non-polar and are small enough to squeeze through the membranr
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