Showing posts with label
biology module 1 3.membrane structure and function.
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Showing posts with label
biology module 1 3.membrane structure and function.
Show all posts
3.3 investigate the effects on plant cells of immersion into solutions of different water potentials
high water potential outside and low water potential inside plant cell
- there is osmotic uptake of water where water diffuses into the cell through the partially permeable membrane
- cell contents expands and pressure of the cell content increase and push out on the cell wall
3.2 explain processes of diffusion, facilitated diffusion, osmosis, active transport, endocytosis and exocytosis
Passive process - when is substances do not require energy to move up to concentration gradient. Example diffusion, facilitated diffusion and osmosis
Active transport - substances require energy to move up their concentration gradient
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A symport allows two substances to pass through at the same time
3.1 explain the fluid mosaic model of the membrane structure
Cell surface membrane is called the fluid mosaic structure because molecules are in constant motion which makes the structure fluid and when viewed from above the pattern of protein molecules look mosaic
Diagram of phospholipid bilayer
