Please enable JavaScript.
Coggle requires JavaScript to display documents.
plasma membranes (structure and function (phospholipid bilayer -…
plasma membranes
structure and function
-
intrinsic proteins - embedded through both layers of the membrane, channel proteins and carried proteins
-
-
glycolipids - lipids with attached carbohydrate chains, are antigens that can be recognised by immune system cells
glycoproteins - intrinsic proteins with carbohydrate chains, have a role in cell adhesion, receptors for chemical signals, and cell signaling
-
osmosis
diffusion of matter leads to hydrostatic pressure if in a closed system,
animal cells - when water moves into the cell the hydrostatic pressure increases and the cell could burst which is cytolysis, if water leaves the cell the pressure is reduced and it can become crenated
diffusion of water across a partially permeable membrane, when solutions of different water potentials are operated by a partially permeble membrane there will be a movment of water
plant cells - when water enters the cell it does not Burt due to the cell wall so it becomes turgid, when water leaves the cell it becomes playmolysed
active transport
the molecule binds to a receptor causing ATP to bind on the inside and be hydrolysed into ADP, binding of the phosphate group causes the protein to change shape allowing the molecule throuhgh before the phosphate molecule is released and the protein returns to its original shape
-
moves particles from a low to a high concentration, requires energy and carrier proteins which act as pumps
diffusion
facilitated diffusion - used channel proteins or carrier proteins which change shape when when a specific molecule binds
a passive process, the increase of temperature and concentration will increase the rate of diffusion, also affected by membrane surface area and thickness
-
-