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| Question | Answer |
| 1.4.U1 Membrane Transport Particles Move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport. | 1.Simple Diffusion- When solutes diffuse through the lipid bilayer passively to get to the lower concentration gradient 2.Facilitated diffusion- Diffusion through transport proteins; helps particles pass through the membrane through from higher concentration to lower concentration 3.Osmosis- Net movement of water particles freely in one direction to the lower concentration gradient 4. Active transport- Movement through the transport requiring energy to move to the higher concentration gradient |
| 1.4.U2 Membrane Transport The fluidity of membranes allows materials to be taken into cells by endocytosis or released by exocytosis | 1. Endocytosis- The vesicle is formed on the inside of the plasma membrane. It contains material that was outside the cell, so this is a method of taking material into the cell. 2. Excotytosis- If a vesicle fuses with the plasma membrane, the contents are then outside the membrane and therefore outside the cell. |
| 1.4 U3 Membrane Transport Vesicles move materials within cells | 1. A small sac of membrane with a droplet of fluid inside, are spherical, normally present in eukaryotic cells, and are used to move materials around inside cells. |
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