Transport 0.0 / 5 ? BiologyCellular processesASAQA Created by: JasmineRCreated on: 06-12-15 15:20 Simple diffusion Transport of substances through the phospholipid bilayer only. Substances transported: Lipid soluble molecules. Very small molecules. Transport is always down a concentration gradient (from a higher concentration to a lower concentration). This process is passive (no ATP/energy is required). 1 of 4 Facilitated diffusion Transport of substances through specific transport proteins. Transport of larger poar/water soluble molecules (e.g. glucose and amino acids) through transport proteins (can be called carrier proteins). Transport of ions (e.g. sodium (Na+), potassium (K+) and chloride (Cl-)) through ion channels or pores. Transport is always down a concentration gradient. The process is passive (no ATP/energy required). 2 of 4 Osmosis Special type of simple diffusion. Transport of water molecules only. Water (although not lipid soluble) is small enough to pass through the phospholipid bilayer. Transport is down a water potential gradient from higher (less negative) water potential to lower (more) negative water potential. The process is passive (no ATP/energy required). 3 of 4 Active transport Transport of polar molecules and ions via transport proteins, same as facilitated diffusion. However: Transport is always against a concentration gradient (from a lower concentration to a higher concentration). The process is active (it requres energy from ATP). 4 of 4
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