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Introduction to the lesson
Chapter 4 is a crucial section in understanding biology. Go over your mindmap and make sure that you have covered all the material. Make sure you know the functions of the different parts of the cell membrane and identify them on a diagram. Know the different types of transport, where they occur, how they occur and why they are important.
Summary
Read the summary on p.88 of your text book.
End-of-chapter questions
- Answer the end-of-chapter questions (p.89-92 of your text book).
- Mark your work (refer to the CD-ROM for answers) and make sure you understand what you did wrong.
- Complete the Fluid Mosaic Model Revision Exercise without looking in your text book. When you have finished, check your answers in your text book. You can download the exercise from your download area on the My Accounts menu.
Useful resources for chapter four
Structure of cell surface membranes
Tom Dare: a very good explanation of the structure of the cell membrane and the experimental evidence for this structure. Unfortunately the part 2 & 3 promised in this video are not yet available.
Cell signalling
Professor Dave Explains: a detailed explanation of cell signalling. He goes into much more detail than you need to know for AS biology but it will help you in chapter 11 and it is useful to know anyway. Don't worry too much, though, if you find it a bit confusing.
Movement into and out of cells
Professor Dave Explains: a comprehensive explanation of the different process by which molecules and ions can move into and out of cells.
Mr Pollock: a simple but good explanation of diffusion, facilitated diffusion, and active transport.