1.3  Membrane Structure

big ninja

Essential Idea:

The structure of biological membranes 

makes them fluid and dynamic


  • Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules
  • Membrane proteins are diverse in terms of structure, position in the membrane and function
  • Cholesterol is a component of animal cell membranes


  • Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes


  • Drawing of the fluid mosaic model
  • Analysis of evidence from electron microscopy that lead to the proposal of the Davson-Danielli model
  • Analysis of the falsification of the Davson-Danielli model that lead to the Singer-Nicolson model