Complete the sentences.
Choose answers from the list:
When there is a high concentration of soluble food molecules in the small intestine, they can move into the bloodstream down their concentration gradient by the process of \text{________________________}.
Mineral ions are often absorbed from a low concentration in the gut into a higher concentration in the cells against the concentration gradient by the process of \text{________________________}.
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.