Oxygen diffuses across a membrane into a culture of respiring animal cells.
When the membrane is 0.12 mm thick, the rate of diffusion is 15 μmol min−115\,\mu\mathrm{mol\,min^{-1}}15μmolmin−1.
The membrane is replaced with one that is 0.36 mm thick. The surface area and concentration difference remain unchanged.
Predict the rate of diffusion through the replacement membrane.
Give a reason for your answer.
102 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.