BIOL240 Chapter Notes - Chapter 2.4: Fluid Mosaic Model, Lipid Bilayer, Hopanoids
3 Jan 2019
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Phosphate group (other polar molecules) + fatty acid chain + glycerol backbone. Amphipathic - contains both hydrophilic and hydrophobic components. Hydrophobic: fatty acid chains (hydrocarbons) and glycerol component that folds an inward envelope, only coming into contact with the internal environment of the cell. Hydrophilic: phosphate and polar groups that interact with the external environment of the cell. Fluid mosaic model: phosphate groups are not covalently linked together, allowing the molecules to move laterally and cell to take different shapes (if no cell wall present) Hopanoids: sterol like molecules that exist in 10% of bacterial cell membranes (unlike cholesterol in eukaryotic membranes) Make up a large component of plasma membranes, either because they are simply moving through to get into the cell or are a part of it. Amphipathic nature as well, hydrophobic components interact with the inside and hydrophilic that interact with exterior. Proteins can be are part of the plasma membrane because:
