OCR A Level Biology Biological Membranes Written Exam Questions – 20 Question Marked Quiz
Twenty real OCR A exam questions on the fluid mosaic model, membrane permeability, diffusion, active transport and osmosis, marked as you go with OCR mark schemes and examiners' report tips.
How things cross membranes - resources and exam questions (lots of application and data analysis)
Cell membranes, osmosis, diffusion , active transport, - lots of experimental and application questions

