Content Objective: To evaluate the various models of membrane structure and explain why certain models were rejected and some were not.
Language Objective: Analyse, with evidence, why the Davson-Danielli model was ultimately rejected for the Fluid Mosaic Model put together by Singer and Nicholson (fluid mosiac model).
Book Reference: 27
Syllabus Details:
Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model
Analysis of the falsification of the Davison-Danielli model that led to the Singer-Nicolson model
Activity 1
Please work through the activity below. This looks at the evidence for membranes and goes through two different models of membrane structure. It is a challenging exercise in that you need to figure out what the evidence means in regard to membranes. Please feel free to work together and use the resources below. You will need them. You will need to fill out the membrane analysis sheet.
Files:
Student - Membrane Analysis Sheet
A. Strengthen Your Skills
Cell Membranes - Bioknowledgy - Look on slide 22 for help with the various models
Membrane Models - also a good resource.
Membrane Modes 2 - A bit more detail
B. Expand Your Knowledge
An updated view of the Singer-Nicholson Model - a good history, a bit complex but gives you a good overall picture.