Complete the sentences describing transport processes in cells.
Choose answers from the list:
During gas exchange in the lungs, oxygen gas moves from a high concentration in the alveolar air space into the lower concentration of the blood capillary by the process of ________________________.
Marine algae maintain a high internal concentration of potassium ions compared to the surrounding seawater, absorbing these ions against their concentration gradient by the process of ________________________.
30 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.