1.3 - ibbriner

1.3 - Membrane structure

DCS Topic Code	Statement	Guidance
1.3.U1	Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules.	Amphipathic phospholipids have hydrophilic and hydrophobic properties.
1.3.U2	Membrane proteins are diverse in terms of structure, position in the membrane and function.
1.3.U3	Cholesterol is a component of animal cell membranes.
1.3.A1	Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes.
1.3.S1	Drawing of the fluid mosaic model.	Drawings of the fluid mosaic model of membrane structure can be two dimensional rather than three dimensional. Individual phospholipid molecules should be shown using the symbol of a circle with two parallel lines attached. A range of membrane proteins should be shown including glycoproteins.
1.3.S2	Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model.
1.3.S3	Analysis of the falsification of the Davson-Danielli model that led to the Singer-Nicolson model.