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4. Cell Membranes and Transport

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  1. 4.1 Fluid Mosaic Membranes

    1. 4.1.1Fluid mosaic membrane model

      • Fluid mosaic model: hydrophobic/hydrophilic interactions in phospholipid bilayer and protein arrangement

    2. 4.1.2Membrane component arrangement

      • Arrangement of cholesterol, glycolipids, glycoproteins

    3. 4.1.3Role of membrane components

      • Roles of membrane components: - Phospholipids, cholesterol: stability, fluidity, permeability - Proteins: transport (carrier/channel proteins), cell signalling (receptors), cell recognition (antigens) - Glycolipids and glycoproteins

    4. 4.1.4Cell signalling process

      • Cell signalling process: - Secretion of ligands from cells - Transport to target cells - Binding to cell surface receptors

  2. 4.2 Movement Into and Out of Cells

    1. 4.2.1Membrane transport processes

      • Processes: simple diffusion, facilitated diffusion, osmosis, active transport, endocytosis, exocytosis

    2. 4.2.2Diffusion and osmosis investigations

      • Investigate diffusion and osmosis using plant tissue, dialysis tubing, agar

    3. 4.2.3Surface area to volume ratios

      • Surface area to volume ratios: calculate for 3-D shapes

    4. 4.2.4SA:V ratio investigation

      • Investigate SA:V ratio effects using agar blocks

    5. 4.2.5Water potential investigation

      • Investigate water potential effects on plant tissues

    6. 4.2.6Water movement between cells

      • Water movement between cells: water potential, effects on plant vs animal cells