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biological membranes - Coggle Diagram
biological membranes
structure and roles
phospholipid bilayer
fluid mosiac model
components
cholesterol-stability
channel protiens- transport
carrier protiens- transport
glycoproteins - recognition and communication
glycolipids- recognition and communication
cell signalling
transport across a membrane
simple and facilitated diffusion
factors affecting rate of diffusion
temp
concentration gradient
surface area
thickness of exchange surface
agar jelly cube experiment to investigate surface area
facilitated needs carrier or channel protiens
active transport
up a concentration gradient
uses ATP and turns into ADP
osmosis
isotonic= normal cell
hypotonic= too much water
hypertonic= not enough water
potato investigation, mass change
Bulk transport
endocytosis
exocytosis
phospholipid bilayer
fatty acid tails and phosphate head
heads hydrophilic face outwards
tails hydrophobic and face inwards
factors affecting structure and permeability of membranes
temperature
solvents
investigating permeability
cut beetroot cubes
range of temps/ solvents in either diloution series or water bath
allow pigment to leak out of beetroot
measure absorbance using colorimeter