The rate of active transport in root cells rises as the temperature increases from 5 °C to 35 °C, but falls sharply above 45 °C. Which explanation accounts for both parts of this pattern?
Respiration speeds up as temperature rises, then the gradient is reversed
Diffusion speeds up as temperature rises, then the cell's enzymes are denatured
Diffusion speeds up as temperature rises, then the concentration gradient falls
Respiration speeds up as temperature rises, then its enzymes are denatured
58 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.