Describe the processes of simple diffusion and facilitated diffusion.
State what microvilli are in terms of cell structure.
Vitamin D is a fat-soluble substance. Micelles are involved in the absorption of vitamin D. Describe the process of vitamin D absorption into the epithelial cells lining the ileum.
12 exam-style questions on AQA A Level Biology Digestion and absorption, covering Digestion and absorption. Each one has a worked solution and a mark scheme showing where the marks go.