Topic 1.3: Membrane Structure
Essential Idea: The structure of biological membranes makes them fluid and dynamic.
At SHS, Topic 1.3 is taught in the following class unit(s):
Statements & Objectives:
1.3.U1 Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules.
1.3.U2 Membrane proteins are diverse in terms of structure, position in the membranes 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.
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.
1.3.NOS1 Using models as representations of the real world-there are alternative models of membrane structures.
1.3.NOS2 Falsification of theories with one theory being superseded by another-evidence falsified the Davson-Danielli model.