1. Organisation and the Digestive system
2. Organising plants and animals
3. Communicable diseases
4. Cell structure and transport
4.1. Keywords
4.1.1. Eukaryotic cell
4.1.1.1. Animal, plant and fungus cells. Their DNA is confined to a nucleus.
4.1.2. Prokaryotic cell
4.1.2.1. Bacterium cell. Their DNA is not confined to a nucleus.
4.1.3. Diffusion
4.1.3.1. The spreading of particles from area of high to low concentration.
4.1.4. Osmosis
4.1.4.1. The diffusion of water through a partially permeable membrane from an area of high to low concentration of water.
4.1.5. Active transport
4.1.5.1. The movement of substances from a dilute solution to a more concentrated solution. Requires energy.
4.1.6. Partially permeable membrane
4.1.6.1. A membrane that only allows certain substances to go through.
4.2. Factors affecting the rate of diffusion
4.2.1. Higher concentration gradient = faster rate of diffusion.
4.2.2. Higher temperature = faster rate of diffusion.
4.2.3. Larger surface area of the membrane = faster rate of diffusion.