Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can explain how selective permeability allows a cell to build and keep concentration gradients. (Guide: “Why cells keep gradients”)
- I can explain diffusion as net movement caused by random motion, and describe what happens at dynamic equilibrium. (Guide: “Concentration gradients and diffusion”; Practice Q2)
- I can define passive transport and name its three types, including the one that uses proteins. (Guide: “Passive transport”; Practice Q1)
- I can define active transport by its direct energy input, and explain why it can move substances from low to high concentration. (Guide: “Active transport”; Practice Q3)
- I can describe endocytosis and exocytosis, give an example of each, and explain why both need energy. (Guide: Figure 1 and “Bulk transport”; Practice Q6)
Calculation and skills
- I can calculate a rate of uptake and an inside : outside concentration ratio from data. (Guide: Worked example 1; Practice Q7)
- I can calculate a percentage change or a percentage of a maximum from transport data. (Guide: Worked example 2; Practice Q4)
- I can calculate how much membrane exocytosis adds and compare it with the cell’s surface area. (Guide: “Membrane bookkeeping”; Practice Q6)
Reasoning
- I can use two lines of evidence (build-up above the outside concentration, and dependence on ATP) to decide whether uptake is passive or active. (Guide: Worked example 1; Practice Q3, Q4)
- I can explain why a temperature experiment is a weak test of ATP dependence. (Guide: Worked example 2)
- I can evaluate a transport claim and propose an investigation with variables, controls and predicted results. (Guide: Worked example 2; Practice Q5)
- I can predict how stopping ATP production affects simple diffusion, active transport and exocytosis. (Practice Q7)
All ticked? Move on to Topic 2.6, Facilitated Diffusion, or return to the course roadmap.