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Cell membranes and transport
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The fluid mosaic membrane

The fluid mosaic membrane

Annotated cross section of a cell surface membrane showing phospholipid bilayer, proteins, cholesterol and carbohydrate chains A cell surface membrane is about 7 nm thick and follows the fluid mosaic model. It is a phospholipid bilayer, with hydrophilic phosphate heads facing watery surroundings and hydrophobic fatty acid tails pointing inward.

Cell membranes and transport Lesson

  1. A Level
  2. /Biology
  3. /Cell membranes and transport

Step-by-step lessons on Edexcel A A Level Biology Cell membranes and transport. Each one builds up to exam-style questions. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.

Lessons